#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        long double a,b,c;
        cin>>a>>b>>c;
        int flag=0;
        long double dela=sqrt(b*b-4*a*c);
        if(dela-(int)dela==0)
            cout<<"YES"<<endl;
        else
            cout<<"NO"<<endl;

    }
return 0;
}