StrateandLevel
I dont think so:
Flight crew can declare emergencies at two levels: Pan and Mayday. A Pan call concerns the safety of an aircraft, or of a person on board, where immediate assistance is not required. A Mayday call is the more serious. A Mayday call does not necessarily indicate that the aircraft is in imminent danger but that the crew requires urgent attention from the air traffic controller.
If you issued a PAN PAN PAN alert, and meanwhile you could restart the engine, you may cancel the alert.
.. .. .. assuming you know why it stopped in the first place that is.