#include <stdio.h>
#include <string.h>
#include <math.h>
#include <algorithm> 
using namespace std;
typedef long long ll;
int main()
{
    int t;
    ll a,b,c,x;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%I64d %I64d %I64d",&a,&b,&c);
        if((b*b-4*a*c)<0)
            {
                printf("NO\n");
                continue;
            }
        else
        {
            x=sqrt(b*b-4*a*c);
            if(x*x!=(b*b-4*a*c))
                printf("NO\n");
            else
                printf("YES\n");
        }
    }
    return 0;
}