#include<iostream>
using namespace std;
int main() {
	
	long long N;
	short move=0;
	long long hoge[2];
	cin >> N;
	for (int i=2;i*i<=N;i++) {


		if (N%i == 0) {
			hoge[move] = i;
			move++;
		}

		if(move==2){
			if(hoge[0]*hoge[1]==N){
				cout << "NO";
			}
			else{
				cout << "YES";
			}
			break;
		}		
	
	}

	if (move < 2) {
		cout << "NO";
	}

	cout << endl;


}