If it says something like "version 2.3.3 (12341234)" with nothing else following it, then you have no hacks installed. If there is a hack installed, then after the closing parenthesis there will be more stuff consisting of a few cryptic letters and then a version number.
I have Version: Kindle 2.3 (399380047). Maybe I missed a previous update? Anyway, it looks like I was successful. I just don't remember the font looking this nice before the hack.
Thank you, NogDog, Jason, and LauraB. I really appreciate it.