题解

题解：

#include <iostream>
using namespace std;
int main(){
    int n,i;
    cin >> n;
    bool a;
    if(n == 2){
        a = true;
    }else{
        for(i = 2; i <= n - 1; i++){
            if(n % i == 0){
                a = false;
                break;
            }
        }
        if(i == n){
            a = true;
        }
    }
    if(a == true){
        cout << "Yes";
    }else{
        cout << "No";
    }
    return 0;
}