diff --git a/core-java/src/main/java/com/baeldung/primechecker/BigIntegerPrimeChecker.java b/core-java/src/main/java/com/baeldung/primechecker/BigIntegerPrimeChecker.java
new file mode 100644
index 0000000000..1ac4fed63f
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/primechecker/BigIntegerPrimeChecker.java
@@ -0,0 +1,13 @@
+package com.baeldung.primechecker;
+
+import java.math.BigInteger;
+
+public class BigIntegerPrimeChecker implements PrimeChecker{
+
+    @Override
+    public boolean isPrime(int number) {
+        BigInteger bigInt = BigInteger.valueOf(number);
+        return bigInt.isProbablePrime(100);
+    }
+
+}
diff --git a/core-java/src/main/java/com/baeldung/primechecker/BruteForcePrimeChecker.java b/core-java/src/main/java/com/baeldung/primechecker/BruteForcePrimeChecker.java
new file mode 100644
index 0000000000..7a94479b8f
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/primechecker/BruteForcePrimeChecker.java
@@ -0,0 +1,13 @@
+package com.baeldung.primechecker;
+
+import java.util.stream.IntStream;
+
+public class BruteForcePrimeChecker implements PrimeChecker{
+
+    @Override
+    public boolean isPrime(int number) {
+        return IntStream.range(2, number).filter(n -> (number % n == 0)).count() == 0;
+    }
+
+    
+}       
diff --git a/core-java/src/main/java/com/baeldung/primechecker/OptimisedPrimeChecker.java b/core-java/src/main/java/com/baeldung/primechecker/OptimisedPrimeChecker.java
new file mode 100644
index 0000000000..40669f4181
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/primechecker/OptimisedPrimeChecker.java
@@ -0,0 +1,15 @@
+package com.baeldung.primechecker;
+
+import java.util.stream.IntStream;
+
+public class OptimisedPrimeChecker implements PrimeChecker{
+
+    @Override
+    public boolean isPrime(int number) {
+        return IntStream.range(2, (int)Math.sqrt(number) + 1)
+            .filter(n -> (number % n == 0))
+            .count() == 0;
+    }
+
+    
+}
diff --git a/core-java/src/main/java/com/baeldung/primechecker/PrimeChecker.java b/core-java/src/main/java/com/baeldung/primechecker/PrimeChecker.java
new file mode 100644
index 0000000000..22260268bc
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/primechecker/PrimeChecker.java
@@ -0,0 +1,6 @@
+package com.baeldung.primechecker;
+
+public interface PrimeChecker {
+    
+    public boolean isPrime( int number );
+}
diff --git a/core-java/src/main/java/com/baeldung/primechecker/PrimesPrimeChecker.java b/core-java/src/main/java/com/baeldung/primechecker/PrimesPrimeChecker.java
new file mode 100644
index 0000000000..0c6a636612
--- /dev/null
+++ b/core-java/src/main/java/com/baeldung/primechecker/PrimesPrimeChecker.java
@@ -0,0 +1,12 @@
+package com.baeldung.primechecker;
+
+import org.apache.commons.math3.primes.Primes;
+
+public class PrimesPrimeChecker implements PrimeChecker{
+
+    @Override
+    public boolean isPrime(int number) {
+        return Primes.isPrime(number);
+    }
+
+}
diff --git a/core-java/src/test/java/com/baeldung/primechecker/BigIntegerPrimeCheckerTest.java b/core-java/src/test/java/com/baeldung/primechecker/BigIntegerPrimeCheckerTest.java
new file mode 100644
index 0000000000..6a5228cc50
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/primechecker/BigIntegerPrimeCheckerTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.primechecker;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class BigIntegerPrimeCheckerTest {
+
+    PrimeChecker primeChecker = new BigIntegerPrimeChecker();
+    
+    @Test
+    public void givenPrimeNumber_whenCheckIsPrime_thenTrue(){
+        assertTrue(primeChecker.isPrime(13));
+        assertTrue(primeChecker.isPrime(1009));
+    }
+    
+    @Test
+    public void givenNonPrimeNumber_whenCheckIsPrime_thenFalse(){
+        assertTrue(!primeChecker.isPrime(50));
+        assertTrue(!primeChecker.isPrime(1001));
+    }
+    
+}
diff --git a/core-java/src/test/java/com/baeldung/primechecker/BruteForcePrimeCheckerTest.java b/core-java/src/test/java/com/baeldung/primechecker/BruteForcePrimeCheckerTest.java
new file mode 100644
index 0000000000..7139373f5e
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/primechecker/BruteForcePrimeCheckerTest.java
@@ -0,0 +1,24 @@
+package com.baeldung.primechecker;
+
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class BruteForcePrimeCheckerTest {
+
+    BruteForcePrimeChecker primeChecker = new BruteForcePrimeChecker();
+    
+    @Test
+    public void givenPrimeNumber_whenCheckIsPrime_thenTrue(){
+        assertTrue(primeChecker.isPrime(13));
+        assertTrue(primeChecker.isPrime(1009));
+    }
+    
+    @Test
+    public void givenNonPrimeNumber_whenCheckIsPrime_thenFalse(){
+        assertTrue(!primeChecker.isPrime(50));
+        assertTrue(!primeChecker.isPrime(1001));
+    }
+    
+    
+    
+}
diff --git a/core-java/src/test/java/com/baeldung/primechecker/OptimisedPrimeCheckerTest.java b/core-java/src/test/java/com/baeldung/primechecker/OptimisedPrimeCheckerTest.java
new file mode 100644
index 0000000000..bb4c06a53a
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/primechecker/OptimisedPrimeCheckerTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.primechecker;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class OptimisedPrimeCheckerTest {
+
+    PrimeChecker primeChecker = new OptimisedPrimeChecker();
+    
+    @Test
+    public void givenPrimeNumber_whenCheckIsPrime_thenTrue(){
+        assertTrue(primeChecker.isPrime(13));
+        assertTrue(primeChecker.isPrime(1009));
+    }
+    
+    @Test
+    public void givenNonPrimeNumber_whenCheckIsPrime_thenFalse(){
+        assertTrue(!primeChecker.isPrime(50));
+        assertTrue(!primeChecker.isPrime(1001));
+    }
+    
+}
diff --git a/core-java/src/test/java/com/baeldung/primechecker/PrimesPrimeCheckerTest.java b/core-java/src/test/java/com/baeldung/primechecker/PrimesPrimeCheckerTest.java
new file mode 100644
index 0000000000..f8b194e855
--- /dev/null
+++ b/core-java/src/test/java/com/baeldung/primechecker/PrimesPrimeCheckerTest.java
@@ -0,0 +1,22 @@
+package com.baeldung.primechecker;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class PrimesPrimeCheckerTest {
+    PrimeChecker primeChecker = new PrimesPrimeChecker();
+
+    @Test
+    public void givenPrimeNumber_whenCheckIsPrime_thenTrue() {
+        assertTrue(primeChecker.isPrime(13));
+        assertTrue(primeChecker.isPrime(1009));
+    }
+
+    @Test
+    public void givenNonPrimeNumber_whenCheckIsPrime_thenFalse() {
+        assertTrue(!primeChecker.isPrime(50));
+        assertTrue(!primeChecker.isPrime(1001));
+    }
+
+}