[mmahemoff]

Yes, I found the UX aspect here interesting as it twisted my brain a bit too. A current example of this is the Brexit referendum, where the question was initially posed as a Yes or No, but required revision to a "Remain" or "Leave", which is much easier for casual observers to grok and lets people get behind their favourite actual position instead of embracing an arbitrary Boolean value (as happened with the Scottish referendum's Yes and No camps).

Also, Prime itself is a tricky term for a Yes-No question as it's really a negative concept - the absence of something. So asking if X is prime is requiring double-negative logic in the same way as an app setting like "Disable X feature [On / Off]".