#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic warning "-Wunused-function"
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;
using mint2 = static_modint<4096>;
using mint5 = static_modint<244140625>;

bool solve() {
  string s;
  cin >> s;
  mint2 r2;
  mint5 r5;
  for(char c: s) {
    int d = c - '0';
    r2 = 10 * r2 + d;
    r5 = 10 * r5 + d;
  }
  if (r2 != 0) {
    bool ok = false;
    for(mint2 v = 1; v.val(); v++) {
      if (v * v == r2) {
        ok = true;
        break;
      }
    }
    if (!ok) return false;
  }
  if (r5 != 0) {
    bool ok = false;
    for(mint5 v = 1; v.val(); v++) {
      if (v * v == r5) {
        ok = true;
        break;
      }
    }
    if (!ok) return false;
  }
  return true;
}

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout << (solve() ? "YES\n" : "NO\n");
}