#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;


}