/*
 *     Author:  srtry
 *     Created: 2025-05-25T07:18:26+09:00
 *     Coding:  utf-8-unix
 */

use proconio::input;
use std::io::{stdout, BufWriter, Write};

fn main() {
    input! {
        n:usize
    }
    


    let out = stdout();
    let mut out = BufWriter::new(out.lock());
    if n==1 {
        write!(out, "{}", "NO").unwrap();
        return
    }
    let sqrt_n: usize = ((n as f64).sqrt() as usize) / 1;
    let mut is_prime:Vec<bool> = vec![true;sqrt_n+1];
    is_prime[0] = false;
    is_prime[1] = false;

    let mut n_ = n.clone();
    let mut is_yes = false;
    for i in 2..=sqrt_n {
        if is_prime[i] {
            loop {
                if n_==1 || n==i*i{
                    write!(out, "{}", "NO").unwrap();
                    return
                }
                if n_%i==0{
                    if is_yes {
                        write!(out, "{}", "YES").unwrap();
                        return
                    }
                    n_ /= i;
                    is_yes = true;
                } else {
                    break;
                }
            }
            for j in i..=sqrt_n/i {
                is_prime[i*j] = false;
            }
        }
    }

    write!(out, "{}", "NO").unwrap();
}