Question 10 Assignment

#include <stdio.h>

int main()
{
    int counter,j, num1, num_prime;

    printf ("Enter a number:\n");
    scanf ("%d", &num1);

    for (counter=2 ; counter <= num1 ; counter++){
            if (num1 % counter == 0){
                num_prime = 1 ;
                for ( j = 2 ; j <= counter/2 ; j++){
                    if (counter % j == 0){
                        num_prime = 0 ;
                        break;
                    }
                }

                if (num_prime == 1){
                    printf("%d\n", counter);
                }
            }
    }
    return 0;
    }