#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <algorithm>
#include <iostream>
#include <cmath>
using namespace std;
long long a,b,c;
int main(){
    int T;
    cin >> T;
    for(int i = 1; i <= T; i++){
        cin >> a >> b >> c;
        if(b*b-4*a*c < 0){
            puts("NO");
            continue;
        }
        long long sq = (long long)(sqrt(b*b-4*a*c));
        if(sq * sq != b*b-4*a*c){
            puts("NO");
            continue;
        }
        if(b > 0 && a*c > 0){
            puts("YES");
        }
        else puts("NO");
    }
    return 0;
}