If you have a "smart tv" you might find the Amazon Prime app on your television's list. I have the app on my Samsung UHD tv and checked it out.
If so you can down-load and install the app. My brother has a 2005 Sony Bravia XBR 55" television. He purchased the Amazon internet box ($90.) and already was signed up to Amazon Prime so he just followed registration set-up. The box contains many other apps such as You Tube, etc. He happens to be with Charter cable. The box allows an older television to view apps on broadband internet.