Pranto's Problem 6

#include <stdio.h>
#include <math.h>

int main() {
    int sum = 0, n;
    printf("Enter any integer:\n");
    scanf("%d", &n);
    int num = n;

    while (n > 0) {
        sum += (n % 10);
        n /= 10;
    }

    printf("Sum of its digits = %d. ", sum);
    for (int i = 2; i < sum; i++) {
        if (sum % i == 0) {
            printf("It is not a prime number.\n");
            return 0;
        }
    }
    printf("It is a prime number.\n");
}