UVa 10110 - Light, More Light

#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS 1
#endif

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    unsigned int n; // unsigned since n <= (2^32)-1

    while (scanf("%d", &n) != EOF)
    {
        if (n == 0) break;

        unsigned int root = sqrt(n);

        if (root*root == n) // Is it a perfect square?
            cout << "yes\n";
        else
            cout << "no\n";
    }

    return 0;
}