#include<cstdio>
#include<string>
#include<cstring>
#include<cstdlib>
#include<cmath>
#include<iostream>
#include<algorithm>
#include <cctype>
using namespace std;
int main()
{
    int i,n;
    while(~scanf("%d",&n))
    {
        long long int a,b,c,k;
        double d;
        for(i=0;i<n;i++){
        scanf("%lld%lld%lld",&a,&b,&c);
        k=b*b-4*a*c;
        d=sqrt(k);
        if((int)d==d)
            printf("YES\n");
        else
            printf("NO\n");
        }
    }
    return 0;
}