import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long n = sc.nextLong();
    int count = 0;
    for(long i = 2; i * i <= n; i++) {
      if(n % i == 0) count++;
    }
    String ans = "NO";
    if(count > 1) ans = "YES";
    System.out.println(ans);
  }
}