#include <bits/stdc++.h>

using namespace std;

int main() {
  
  unsigned long long N; cin >> N;
  if(N == 1 || N == 2) { cout << "NO\n"; return 0; }
  bool ok = 1;
  for(unsigned long long i=2; i*i<=N; i++) {
    if(N % i == 0) {
      ok = 0;
      break;
    }
  }
  if(!ok) { cout << "YES\n"; return 0; }
  
  cout << "NO\n";
  
  return 0;
}