#include <iostream>
using namespace std;
int main() {
	long long N; cin >> N;
	int flag = 0;
	for (long long i = 2; i*i <= N;) {
		if (N%i == 0) {
			N /= i;
			if (N == 1) { cout << "NO" << endl; return 0; }
			if (flag == 1) { cout << "YES" << endl; return 0; }
			flag = 1;
			continue;
		}
		i++;
	}
	cout << "NO" << endl;
	return 0;
}