It actually depends on why do you care whether you were a full time student or not.
The biggest reason for wanting to be a FT student is so you can still be claimed as a dependent by your parents. If that's not your goal, it (most likely) really doesn't matter. You are eligible for the tuition credits, either way.
There are some other FT student quirks in the tax code (e. g. dependent care credit, retirement contribution credit).
That said, there is some disagreement in this forum about what constitutes "enrolled". I'm of the opinion that walking the stage, in May, means you meet the 5 month rule for 2022.
