#include <iostream>
#include <algorithm>
#include <cstdio>
#include <vector>
#include <cstring>
#include <queue>
#include <climits>
#include <cmath>

#define LL long long

#define pr pair < int, int >

using namespace std;

LL m,n,a,b,c;

int main()
{
    int T;scanf("%d",&T);
    while(T--){
        scanf("%I64d%I64d%I64d",&a,&b,&c);
        LL x=sqrt(b*b-4*a*c);
        if(x*x==b*b-4*a*c)puts("YES");
        else puts("NO");
    }
    return 0;
}