tj

#include<bits/stdc++.h>
using namespace std;

int main()
{
    int a;
    cin>>a;
    if(a<=1)
    {
        cout<<"No";
        return 0;
    }
    for(int i = 2;i*i<=a;i++)
        {
            if(a%i==0)
            {
                cout<<"No";
                return 0;
            }
        }
    cout<<"Yes";
}