#include <cstdio>
#include <cmath>

typedef long long ll;

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