this is neither the time nor place to explain how to use a multimeter - suffice it to say that if you took the motor to a local city college, the guys teaching any of the electrical shop/electrical engineering courses woudl be able to help, any local radio ham would be able to help, any local motor repair place would be able to help.
testing a motor cap takes all of 30 or 40 seconds. discarding the motor because the cap is bad is kinda like discarding your car because a brake drum cracked - yes, you can do it, but it's not the most economical approach.