That's an easy one to answer. If you push the AM-SAT button more than once and you see SAT1, SAT2 or SAT3 appear on the audio portion of your NAV screen, then you will know that your car is equipped with a satellite receiver. If all you see is AM when pushing the AM-SAT button then there is no satellite receiver and you'll need to get one installed.
Not a dumb question. You learn by asking, right?