#include <bits/stdc++.h>

using namespace std;

#define MAX 10000010
bool prime[MAX];

typedef unsigned long long ull;

void sieve() {
  fill(prime, prime+MAX, true);
  prime[0] = prime[1] = false;
  
  for(ull i = 2 ; i*i < MAX ; i++){
    if(prime[i]){
      for(ull j = i*i ; j < MAX ; j+=i){
	prime[j] = false;
      }
    }
  }
}

int main() {

  sieve();
  ull N; cin >> N;
  
  if(N == 1) { cout << "NO\n"; return 0; }
  
  bool ok = 1;
  for(ull i=2; i*i<=N; i++) {
    if(prime[i] && !(N%i)) {
      ok = 0; break;
    }
  }
  if(!ok) cout << "YES\n";
  else cout << "NO\n";
  
  return 0;
}