Are you referring to the Can Am Spyder?!?
Well, it's a trike, so if you think trikes are motorcycles than yes it's a motorcycle.
I've ridden one and to be honest I was surprised at it's performance but on the other hand it's not a 'two-wheeled' motorcycle and Can Am doesn't claim that it is one exactly, but the DMV didn't have much choice as to where to place it so into the motorcycle category it goes.
They are kind of fun to ride, sort of like snow skiing versus snow-boarding both get you going and keep the heart a-pumping!
Added- @ Firestormer - Yes, you are correct and to add to that the Spyder does have a reverse.