Try rotating the drum manually, it should turn fairly easily.
If OK
This may take two people
Open the door
Hold the door interlock switch closed
Hit the start button and while it is buzzing turn the drum in the correct direction by hand.
Watch your knuckles as it may start up.
If it does start odds are very high that you need a new motor.

I would not order parts till you open it up.
Check the idler roller, front glides, drum seals, belt, rear rollers etc. for wear and bearing slop. You might as well overhaul it, while you have it open.
This will give you a better idea of total repair cost.

Your Model Number seems to missing the first three digits so I could not look up the motor's price on AppliancePartsPro give them a call. Probably a lot cheaper.