#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  ll n;
  cin >> n;
  bool isPrime = true;
  for (ll i = 2; i * i <= n; i++) {
    if (n % i == 0) {
      isPrime = false;
      break;
    }
  }
  cout << (isPrime ? "NO" : "YES") << endl;
  return 0;
}