C Program To Check Number Is Prime Or Not Using If/Else Statements

#include <stdio.h>
int main()
{
   int num, i, j = 0;
   printf("Enter number: ");
   scanf("%d", &num);
   //check for prime number
   for (i = 1; i <= num; i++)
   {
      if ((num % i) == 0)
         {
            j++;
         }
   }
   if (j == 2)
      printf("%d is a prime number.", num);
   else
      printf("%d is not a prime number.", num);
   return 0;
}