prime2

#include <stdio.h>

int main()
{
    int num, i;
    printf("Enetr a number. We can check if it is a prime number.\n");
    scanf("%d",&num);

    if(num == 1)
    {
        printf("%d is not a prime number",num);// 1 is not a prime numebr. When num == 1, return 0.
        return 0;
    }
    else
    {
        for(i = 2; i < num; i++)
        {
            if(num % i == 0)
            {
                printf("%d is not a prime number",num);
                return 0;
            }
        }
        printf("%d is a prime number",num);
        return 0;
    }
}