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Check if a number is Prime

Programme:

#include <stdio.h>
 
main() {
 
  int n, c = 2;
 
  printf("Enter a number to check if it is prime number or not\n");
  scanf("%d", &n);
 
  for (c = 2; c <= n - 1; c++) {
 
    if (n % c == 0) {
 
      printf("%d is not prime.\n", n);
      break;
 
    }
 
  }
 
  if (c == n)
    printf("%d is prime.\n", n);
 
  return 0;
}

Output:

Enter a number to check if it is prime number or not
99
99 is not prime.