#include<cstdio>
#include<iostream>
#include<cstring>
#include<algorithm>
#include<cmath>
using namespace std;
int n;
long long a,b,c;
int main()
{
    cin>>n;
    for(int op=1;op<=n;op++)
    {
        cin>>a>>b>>c;
        long long sum=(long long)(sqrt((double)(b*b-4*a*c)));
        if(sum*sum==b*b-4*a*c)cout<<"YES"<<endl;else cout<<"NO"<<endl;
    }
    return 0;
}