# include<iostream> using namespace std; int main(){ int n; cin>>n; int i=2; /* while(n%i!=0&&n!=1){ i++; } if(i==n) cout<<"Yes"<<endl; else cout<<"No"<<endl; */ bool f=true;//用来标记n是否为质数的，默认是true while(i*i<=n){ if(n%i==0){ f=false; break; } else i++; } if(f==true) cout<<"Yes"<<endl; else cout<<"No"<<endl; }