Good Medium Format Cameras Very Informative For A Novice. What Size _ X _ Is A Square Format Photograph,like In Medium Format Cameras? AlthoI Am Referring To Digital?

What size _ x _ is a square format photograph,like in medium format cameras? althoI am referring to digital? - good medium format cameras very informative for a novice.

I can not in that order. I'm an avid photographer, "amateur", but I'm firmly with this issue for some time. and "format" the right word to describe an image - even if the medium format film or not? A QUESTION FOR ALL YOUR photographers there:) Thank you.