import java.util.*;
public class hate{
	public static void main(String... args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		System.out.println(judge(n));
	}
	public static String judge(long n){
		long N = n;
		for(long i = 2; i < Math.sqrt(n); i++){
			while(N%i==0){
				N /= i;
			}
		}
		if(N>1)return "YES";
		return "NO";
	}
}