public class Main {
        public static void main(String[] args) {
          int num = 33, i = 2;
          boolean flag = false;
          while (i <= num / 2) {
            // condition for nonprime number
            if (num % i == 0) {
              flag = true;
              break;
            }
            ++i;
          }
          if (!flag)
            System.out.println(num + " is a prime number.");
          else
            System.out.println(num + " is not a prime number.");
        }
      }
      
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      Lops of while

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