You can read page numbers in two ways. Control Shift N is the Go To command for JAWS with Acrobat Reader. Hit this and you can hear the current page number as well as use it to navigate to other pages.
You can also bring up the status bar by first hitting Insert F4, and then hitting Inserrt Page Down. JAWS will say something like 1/8, indicating that you are on the first of a total of 8 pages. It is only necessary to hit Insert F4 the first time in a given session. Inserrt Page Down by itself will work for accessing it subsequent times during that session.