#include<iostream>
#include<math.h>
using namespace std;
int main() {

	long long N;
	short move = 0;
	long long hoge[2];
	cin >> N;
	for (int i = 2; i < sqrt(N); i++) {

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

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

	}

	if (move==0) {
		cout << "NO";
	}
	else if (move == 1) {

		for (int i = sqrt(N); i <= N / 2; i++) {

			if(N%i==0){
				if(hoge[0]*i==N){
					cout << "NO";
				}
				else {
					cout << "YES";
				}
			}

		}
	
	}

	cout << endl;


}