I think divisibility rules deserve their very own page. The subject of divisibility alone is plenty big enough as it is.--MCrawford 18:15, 18 June 2006 (EDT)

Indeed they do. That page should also contain derivations, etc. I just moved around a bit of the article, and made the divisibility section a sub-section. --IntrepidMath 18:23, 18 June 2006 (EDT)