If someone buys a print does that mean they now own it?

Question

Or they're just buying a print, right?

I know nothing of prints.

Answer 1

Morally, yes. Legally, also yes...but they don't necessarily have the legal right to copy it or use it for commercial purposes.

Answer 2

You are most likely just buying the print.  The photographer will still retain the rights to reproduce the original image.

This is something you should ask before purchasing a print from a photographer and it is a completely normal question to ask.  Sometimes the back of the photos will actually state that "Such and Such Photography" owns the reproduction rights to the photo.

Unless specifically stated, events like wedding photos almost always remain in the ownership of the photographer.