import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextInt();
		boolean flag = false;
		sc.close();
		if(N == 1){
			 flag = false;
		}else{
			for(long t=2; t*t<N; t++){
				if(N % t == 0){
					flag = true;
					break;
				}
			}
		}
		if(flag){
			System.out.println("YES");
		}else{
		    System.out.println("NO");
		}
	}
}