If you haven’t put a passcode on your iPad yet, then you definitely should.
It’s easy enough. Head to the Settings app on the iPad, then hit the “general” tab on the left-hand side of the screen. Then hit “passcode lock”.
At the top of the screen, hit “turn passcode on”, and then select a passcode. You can also select “simple passcode” that will allow you to use a simple four-digit PIN instead of a complicated password.