#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,j=0,n;
	cin>>n;
	for(i=2;i<=sqrt(n);i++){
		if(n%i==0){
			j++;
			cout<<i;
			break;
		}	
	} 
    if(j==0){
    	cout<<"Yes";
    }
}
/**************************************************************
	Problem: 1061
	User: hongjiaming
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/