ACM 10110 -- Light, more light

#include <iostream>
#include <math.h>
#include <sstream>
#include <stdio.h>
#include <cstdio>

using namespace std;

bool willLight(double num){
    long long int test = (int) sqrt(num) ;

    if(test*test == num)
        return true;


    return false;
}


int main()
{
    double input;

    while(scanf("%lf", &input)){
        if(input == 0.0)
            break;

        if( willLight(input) )
            cout<<"yes"<<endl;
        else
            cout<<"no"<<endl;
    }

    return 0;
}