#include<iostream>
#include<cstdio>
#include<algorithm>
#include<queue>
#include<vector>
#include<math.h>
#include<set>
#include<map>
#include<cstring>
#include<bitset>
using namespace std;
typedef long long ll;
int t;
ll a,b,c;
int main()
{
    scanf("%d",&t);
    while(t--)
    {
        cin>>a>>b>>c;
        long double s=b*b-4*a*c;
        if(s==0)
            cout<<"YSE"<<endl;
        else if(s>0){
            ll sq=(ll)sqrt(s);
            if(sq*sq==s)
                cout<<"YES"<<endl;
            else
                cout<<"NO"<<endl;
        }
        else
            cout<<"NO"<<endl;
    }
    return 0;
}