codeforces 918 div4

#include<cmath>
#include<iostream>
#define ll long long
using namespace std;
 
bool issq(ll n){
    ll root = sqrt(n);
    return root*root == n ;
　　// 标准写法,其他写法有精度问题
}
 
int main(){
    int t;
    cin>>t;
    while (t--){
        ll x;
        
        cin>>x;
        ll sum =0;
        while (x--){
            ll y;
            cin>>y;
            sum+=y;
        } 
        
        if (issq(sum)) cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
    }
    
   
    return 0;
}