added isPrime function

Author: Grajales-K

Sprint-3/revise/implement/is-prime.js

@@ -0,0 +1,19 @@
+// isPrime.js
+function isPrime(num) {
+  // If the number is less than 2, it is not prime
+  if (num < 2) {
+    return false;
+  }
+
+  // Check if the number has divisors (excluding 1 and itself)
+  for (let i = 2; i <= Math.sqrt(num); i++) {
+    if (num % i === 0) {
+      return false; // If a divisor is found, it is not prime
+    }
+  }
+
+  return true; // If no divisors are found, the number is prime
+}
+
+
+console.log("All test cases executed!");