for(i=2;i<m;i++)，不能用sqrt(m)吗？

#include <cmath>
using namespace std;
int main(){
    int m,n,i,flag;
    cin>>n;
    while(n--){
        cin>>m;
        if(m==1)
        {
            cout<<"No"<<endl;
        }
        else {
            if(m==2||m==3){
                cout<<"Yes"<<endl;
            }
        
        else{
            flag=0;
        for(i=2;i<m;i++){// 
            if(m%i==0){
                flag++;
                break;    
            }        
        }
        if(flag==0){
            cout<<"Yes"<<endl;
        }
        else{
            cout<<"No"<<endl;
        }    
        }
        } 
    }
}