#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=int(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define All(x) (x).begin(),(x).end()
#define rAll(x) (x).rbegin(),(x).rend()
using namespace std;
using ll = long long;

int main(){
    ll s;cin>>s;
    cerr << s << endl;
    ll ans = -1;
    constexpr ll p10_7 = 1e7;
    rep(x, 1000, p10_7 + 1000)
    {
        ll y = (ll)x*x;
        if(s == y % p10_7)
        {
            ans = y;
            cerr << x << " " << x*x << " " << y << endl;
            break;
        }
    }
    cerr << ans << endl;
    std::cout << (ans==-1?"NO":"YES") << endl;
}