Why does WordPress Append -2 to any Numeric Title Page?

Hey Guys,

A customer brought to my attention a very strange issue that I never noticed within WordPress and I didn't have an answer other than its default WordPress.

Does anyone know why WordPress automatically appends "-2" to any page that gets created with a numeric title and slug? This is not an issue with trashed pages not being deleted.

It literally happens to any page that you create with a numeric title like "593935". The slug automatically gets -2 added to it. I noticed this doesn't happen with posts, just for pages. Any ideas? If so, how about a way to avoid this? Thanks everyone!