import java.util.Scanner;

public class yuki36 {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        boolean flag = true;

        int divisorCount = 0;
        for(long i=2; i*i<=N; i++){
            /*if(N%i == 0){
                divisorCount++;
            }*/
        	for(int j=1; Math.pow(i,j)<=N; j++){
        		if(N%Math.pow(i,j)==0){
        			divisorCount++;
        			if(divisorCount==2){
        				break;
        			}
        		}
        		else{
        			break;
        		}
        	}
            if(divisorCount==2){
                System.out.println("YES");
                flag = false;
                break;
            }
        }
        if(flag)
        	System.out.println("NO");
	}

}