# include <bits/stdc++.h>

using namespace std;
bool sushu(int x){
	if(x<=1)return false;
	for(int i =2;i*i<=x;i++)
		if(x%i==0)
		    return false;
	return true;
}
int main(){
	int n;
	cin>>n;
	for(int i =1;i<=n;i++){
		int x;
		cin>>x;
		if(sushu(x)){
			cout<<"Yes"<<endl;
		}else{
		    cout<<"No"<<endl;
		}
	}
	return 0;    
}