UVA Solution for 10110

//10110
#include<stdio.h>
#include<math.h>

int main()
{
long int r;
 double num,root;

while(scanf("%lf",&num)==1)
    {
    if(num==0)
    break;

    r=sqrt(num);
    root=pow(r,2);

    if(root==num)
    printf("yes\n");
    else
    printf("no\n");
    }
return 0;
}