#include<stdio.h>
#include<math.h>
int main()
{
    int x;
    scanf("%d",&x);
    while(x--)
    {
        double a,b,c;
        scanf("%lf%lf%lf",&a,&b,&c);
        double d=b*b-4*a*c;
        if(d>=0&&sqrt(d)==(int)(sqrt(d)))
            printf("YES\n");
        else
            printf("NO\n");
    }
}