Check if Number is Prime

#include <stdio.h>

int main()
{

    int n, c = 2;

    printf("Enter a number to check if it is prime\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
99
99 is not prime.