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

/* Check whether a number given is prime or not.*/

main()
{
    int A, num;

    #define max 2147483647
    #define min -2147483648

    printf("Enter an integer between and including -2147483648 and 2147483647: ");
    scanf("%d", &num);

    if(num < min || num > max){
        printf("This is not a valid input. Aborting.\n");
        return 0;
    }

    for(A=2; A<num/2; A++){
        if(num % A == 0){
            printf("%d is not a prime number. It is completely divisible by %d.\n",num,A);
            return 0;
        }
    }
    printf("%d is a prime number.\n",num);
    return 0;
}