Vmc requires an airplane with more than one engine, not centerline thrust. In layman terms, it's the slowest speed where the flight controls can still maintain directional control under the worst conditions (critical engine, worst CG, max power....) The airplane is not stalled, it's directional control is lost.

Big enormous difference than Vs in a single. It also does not correlate at all with p-factor taking a powerful single off the taxiway due to poor technique.