Five.

Two - if you consider major island groups:
Andaman & Nicobar as one
Lakshwadeep the other

It's impossible to tell, really. Canada has over 30,000 islands in one part alone, but that's in the way far north where very few if any people live. In terms of inhabited islands with over a few thousand people like, thirty.

Country or state?

Two come to mind. 🤔

It's a continent.

No Idea. It's the US.

Hawaii

lots.. 🇦🇺

Fucking fifty