Can I get Amazon Prime on my MacBook?

You should be able to? What happens when you log into your Amazon account from a web browser on your Mac? Can't you order items with your Amazon Prime account?

... or as kaz-k has pointed out, if you are referring to streaming video from Amazon Prime, just try the following:

• Open a web browser and go to the Amazon web site.
• Sign in with your Prime account.
• Click Prime at the top-right of the site.
• Click on Prime Video.
• Click the desired movie/TV show.
• Click on Watch Now.

Just tried in on my 2014 Mac mini, running macOS High Sierra, and it worked for me.

I think you can.

Amazon.com Help: System Requirements for Streaming on Your Computer