does iPad support 2 open documents in Pages

Yes. You can tap the ... dots at the top of the screen in Pages, tap on Split View, then tap the Pages icon on the dock and it should open a new Pages window in Split view, where you can open a new file or Create a new Document in the new window.

Yes. See Use multitasking on your iPad - Apple Support

On iPad 5 with iPadOS 16.5.1 and Pages v13.1 for iOS: