update added

algorithms/Java/Maths/check-prime-or-not.java

@@ -10,7 +10,7 @@ public class main {
 
     public static boolean isPrime(int num) {
         for (int i = 2; i * i <= num; i++) {
-            if (num % 2 == 0) {
+            if (num % i == 0) {
                 return false;
             }
         }