#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> P;
#define REP(i,n) for(int i=0;i<int(n);i++)


int main(void){
	cin.tie(nullptr);  ios_base::sync_with_stdio(false);
	ll i,j,k;

	string s;
	cin >> s;

	ll m=stoll(s);
	for(i=0;i<1000000;i++){
		ll x=i*i;
		if(x%1000000==m){
			cout << "YES" << endl;
			return 0;
		}

	}

	cout << "NO" << endl;

	return 0;
}