import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner koko = new Scanner(System.in);
        int num = koko.nextInt();
        
        int counter = 0;                    
        int ptr = 0;                        
        int[] prime = new int[10000];  

        prime[ptr++] = 2;
        prime[ptr++] = 3;           

        for (int n = 5; n <= 100000; n += 2) {      
            int i;
            for (i = 1; i < ptr; i++) { 
                counter++;
                if (n % prime[i] == 0)      
                    break;                      
            }
            if (ptr == i)                       
                prime[ptr++] = n;              
        }
        int count=0;
        int mul=1;
        for(int j=0; j<ptr; j++){
            if(num<=prime[j]){
                break;
            }else if(num%prime[j]==0){
                count++;
                mul=mul*prime[j];
            }
        }
        if(count>2){
            System.out.println("YES");
        }else if(count==2){
            if(mul==num){
                System.out.println("NO");
            }else{
                System.out.println("YES");
            }
        }else if(count==1){
            if(mul*mul==num){
                System.out.println("NO");
            }else{
                System.out.println("YES");
            }
        }else if(count==0){
            System.out.println("NO");
        }
    }
}