Add Prime number checker

Prime_Number_checker.cpp

@@ -0,0 +1,27 @@
+#include <iostream>
+#include <cmath>
+using namespace std;
+
+// Function to check if a number is prime
+bool isPrime(int n) {
+    if (n <= 1)
+        return false;
+    for (int i = 2; i <= sqrt(n); i++) {
+        if (n % i == 0)
+            return false;
+    }
+    return true;
+}
+
+int main() {
+    int num;
+    cout << "Enter a number: ";
+    cin >> num;
+
+    if (isPrime(num))
+        cout << num << " is a prime number." << endl;
+    else
+        cout << num << " is not a prime number." << endl;
+
+    return 0;
+}