Is it possible to unmount /?
 

Is it possible? I’d like to know.

Yes.
https://linux.die.net/sag/shutdown.html

I know that shutting down the system unmounts root, but is there a way without shutting down?

No, what are you trying to accomplish?

I dunno, was just curious if it was possible.

Easy way to find out: try it. The umount command will tell you the directory is busy.

Is there a way to force unmount the drive?

Yes; read the man page on the mount command.

A good way to corrupt your partition and freeze your system. It's very likely you'll need to run fsck the next time you reboot. So please, use a VM install for experimenting with this.

I didn’t plan on using a real computer for this.

Of course anything is possible.

There's your answer, and others have already said this.

If you have no use case for it except that you wish to know if it is possible, then that's all we can advise you about.

There's also a concept of rotating it, which is not necessarily unmounting it.

It's not worth discussing because you've been asked your goal a few times and all you've said is that you wish to know if it is possible.

Just a tip. You should have added this to the original question. Most members here aren't willing to help a fellow user destroy their OS. This is of course the reason for the vague answers you received.