int is_prime(int x)
{
    int i,c = 0;
    for (i = 1; i <= x; i++)
    {
      if (x % i == 0)
      {
         c++;
      }
    }

  if (c == 2) {
  printf("%d is a Prime number.",x);
  }
  else {
  printf("%d is not a Prime number.",x);
  }
}