Board Thread:Administrative/@comment-1713281-20130318164952/@comment-3048593-20130403223212

Not really, because there is some sort of background to a reality number, like Earth-2149.

4 being the comic they first appeared in (Ultimate Fantastic Four Vol 1), 21 being the issue, 9 being the month that issue was published (September).

Even with Earth-295, 95 being the year (1995) and 2 being the month of February.

And even the most recent one for X-Treme X-Men, Earth-13410. 13 being 2013, 4 being April, and 10 being the issue.