#include <bits/stdc++.h> 
using namespace std;
int main(){
	int z,i=2;
	cin>>z;
	while(i<=z){
		if(z%i!=0){
			i++;
		}else{
			cout<<i;
			break;
		}if(i==z){
			cout<<"Yes";
		} 
	}
}
/**************************************************************
	Problem: 1061
	User: sucongyi
	Language: C++
	Result: Wrong Answer
****************************************************************/