How to tell version from UPPROJECT file?

I have a project I’m working on at school and I wanted to work on it at home but I don’t remember the version of unreal engine I had, so I checked my project’s UPPROJECT file and it said," “FileVersion” 3, " does that mean its unreal engine 3, or is it unreal engine 4 version 3?

No, thats uproject format version number, EngineAssociation say the to which engine the project is associated with, if project been last used with launcher version you should have engine version 4.19, 4.20 etc. on that field if source build version was made you will have long hex number GUID

I know it has been a while since you’ve posted this answer, but what exactly does “uproject format version number” mean?