The math behind 2,4,8,16,32,64,128,256,512,1024,2048,4096,8192, etc is known as "Preferred numbers". With computer architecture these numbers theoretically are the most optimized for calculation. Notice with computer software and hardware: 32 bit and 64 bit operating systems, 512 MB of ram, 8bit/16bit/32bit images, etc. See this wiki for more info: https://en.wikipedia.org/wiki/Preferred_number#Computer_engineering
That's why standard practice for texture resolution is 2048 instead of 2000. Though I can't say I've ever tested for myself the assumed benefit. But there's nothing *wrong* with using 2000 for your texture resolution.
