#include <cstdio>
#include <cmath>
long long a, b, c, d;
int t;
double sd;
bool eps(double x) {
    if (x <= 0.000001) return true;
    return false;
}
int main() {
    scanf("%d", &t);
    for (int i = 0; i < t; ++i) {
        scanf("%I64D%I64D%I64D", &a, &b, &c);
        d = b * b - 4 * a * c;
        sd = sqrt(d);
        if (eps(sd-int(sd))) printf("YES\n");
        else printf("NO\n");
    }
}