import java.io.*;
import java.util.*;

class Main {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static boolean isPrime (long n) {
		if (n == 1 || (n != 2 && n % 2 == 0)) return false;
		for (int i = 3; i * i <= n; i += 2)
			if (n % i == 0) return false;
		return true;
	}
	
	public static boolean solve (long n) {
		if (n == 1) return false;
		for (int i = 2; i * i <= n; i++) {
			if (n % i != 0) continue;
			if (!isPrime(i) || !isPrime(n / i)) return true;
		}
		return false;
	}
	
	public static void main (String[] args) throws IOException {
		
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		out(solve(Long.parseLong(br.readLine())) ? "YES" : "NO");
	}
}