#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        long long int a,b,c;
        cin>>a>>b>>c;
        long long int temp=(int)sqrt(b*b-4*a*c);
        //cout<<temp;
        if(temp*temp!=b*b-4*a*c)cout<<"NO"<<endl;
        else 
        {
            if(-b+temp>=0)cout<<"NO"<<endl;
            else cout<<"YES"<<endl; 
        }
    }
    return 0;
}