#include<stdio.h>
#include<math.h>
int main()
{
    int n;
    long int y;
    double x,s;
    while(scanf("%d",&n)==1)
    {
        if (n==0) break;
        s=sqrt((double)n);
        y=(int long)s;
        x=(double)y;
        if(s==x)printf("yes\n");
        else printf("no\n");
    }
    return 0;
}
/*
#include<stdio.h>
#include<math.h>
int main()
{
    int n,y,m;
    double s;
    while(scanf("%d",&n)==1)
    {
        if (n==0) break;

        s=sqrt((double)n);
        y=(int)s;

        if(s-y==0)printf("yes\n");
        else printf("no\n");
    }
    return 0;
}