Harmy said:

Huh?

Sorry, I was needlessly obtuse, probably because I deal with computers all day.

When you have 10 kilobytes, you don't have 10,000 bytes. You have 10*1024 bytes. Because 1024 is a power of 2, and that's binary and that's how computers work. So 2K is gonna be a multiple of 2...because computers. It doesn't really need to be that way, you could obviously make 2000 the standard if you wanted...but old ways die hard. It's probably that the cost of the difference between 2000 and 2K is minimal or 0, so why not extra pixels.