#include<bits/stdc++.h>
using namespace std;
int main(){
	int x;
	bool y=1;
	int n,i;
	cin>>x;
	for(i=2;i<=sqrt(x);i++){
		if(x%i==0){
			y=0;
			n=i;
			break;
		}
	}
	if(y==1){
		cout<<"Yes";
	}else{
		cout<<i;
	}
	return 0;
}

/**************************************************************
	Problem: 1061
	User: tangkaixuan
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/