Sirius XM has taken over my radio

[asforme]

I purchased a used 2018 RAM 3500 Longhorn. It has the plain jane stock stereo. When I start the vehicle the radio turns on, nothing I can do about that, and Sirius XM radio blasts from the speakers. How can I stop or disable Sirius XM from starting when I start the vehicle. Also is it possible to make the radio connect to my phone via Bluetooth instead? Thanks in advance.