or

  int x;
     printf("Enter an integer: ");
     scanf("%d", &x);
     printf("You entered: %d \n", x);


     for(int i=2; i <= x/i; i = i + 1)
     {
       int factor = x/i;
       if (factor*i == x)
       {
        printf(" false\n  " );
        //break;
       }
       else {
           printf("true\n ");
       }
     }