小测验-函数1

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#include<iostream>
#include<cmath>
using namespace std;

bool prime(int x); 
double Mysqrt(int x);

int main(){
    int n;
    cin>>n;
    if (prime(n)) cout<<"YES";
    else cout<<"NO";
    return 0;
}

bool prime(int x) {
     int j;
     bool p=true;
     j=2;
     while(j<=Mysqrt(x) ){
     if(x%j==0){
     p=false;
     break;
     }
     j++;
   }
  return p;
}

double Mysqrt(int x){
       double p;
       p=pow(x,0.5);
       return p;
}