UVA 10110-Light,more light

	/**
	* Author : Md.Mehadi Hasan Menon.
	* Problem : 10110-Light,more light.
	* Stauts : Accepted.
	* Date : 14.10.2014.
	**/
	#include <stdio.h>
	#include <math.h>
	int main()
	{
	unsigned int n, a;
	while(scanf("%u", &n) == 1 && n != 0)
	{
	/* if n is a prefect square than
	it has odd number of factor */
	a = sqrt(n);
	if(a * a == n)
	printf("yes\n");
	else
	printf("no\n");
	}
	return 0;
	}

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