5.prime or not prime

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

int primeCheck(int n)
{
    int i;
    if(n == 1)
        return 0;

    for(i=2; i<=sqrt(n); i++)
    {
        if( n%i == 0 )
            return 0;

    }
    return 1;
}

int main()
{
    int i, num;
    scanf("%d", &num);

    for(i=1; i<=num; i++)
    {
        if( primeCheck(i) == 1 )
            printf(" %d = Prime!\n", i);
        else
            printf(" %d = Not Prime!\n", i);
    }

    return 0;
}