Lucky for you, Mrs. Nelson came by to (re)introduce us to the library and let us sign out a book. You also got a chance to look at some of the books available at the book fair.
So – no math homework. But… you can check out the BBC Bitesize review page on Number Patterns which covers prime numbers. That might give you a different way to think about it. You can also check out AAAMath for a review and practice.