@[cx331004](/user/1177089)
`for` 循环里 `if` 改为：
```cpp
if(n%i==0){
cout<<"No";
break;
}
```
`return 0;` 前面加个
`cout << "Yes"`
by chuxm @ 2024-04-12 21:57:15
```cpp
#include<bits/stdc++.h>
using namespace std;
long long n;
int main() {
cin>>n;
if(n<2){
cout<<"No";
}
else if(n==2){
cout<<"Yes";
}
else{
for(int i=2;i*i<=n;i++){
if(n%i==0){
cout<<"No";
break;
}
}
cout<<"Yes";
}
return 0;
}
```
by qinshi0308 @ 2024-04-12 21:58:18
@[cx331004](/user/1177089)
by qinshi0308 @ 2024-04-12 21:58:44
@qinshi0308\
谢谢大佬
by cx331004 @ 2024-04-13 13:06:31