diff --git a/C++/prime_number.cpp b/C++/prime_number.cpp
index ab70a13d7..be2f74f36 100644
--- a/C++/prime_number.cpp
+++ b/C++/prime_number.cpp
@@ -14,11 +14,27 @@ bool isPrime(int n)
   
     return true;
 }
-  
+
+
+bool isprimeMethod2(int n){
+ if (n <= 1) return false; // 0 and 1 are not prime numbers
+    if (n <= 3) return true;  // 2 and 3 are prime numbers
+
+    // Check for even numbers and multiples of 3
+    if (n % 2 == 0 || n % 3 == 0) return false;
+
+    // Check from 5 to sqrt(n) for any factors
+    for (int i = 5; i * i <= n; i += 6) {
+        if (n % i == 0 || n % (i + 2) == 0) return false;
+    }
+
+    return true;
+}
 
 int main()
 {
     isPrime(11) ? cout << " true\n" : cout << " false\n";
     isPrime(15) ? cout << " true\n" : cout << " false\n";
+    isprimeMethod2(15) ? cout << " true\n" : cout << " false\n";
     return 0;
 }