Assuming the rules are the borders must not be broken and the sides must be equidistant, I count 16 squares.
Sides being equidistant is a property of square, right? lol
Is it really that funny? I like to cover all the rules bases before answering because someone else giving the test may decide that's not what they figure a square is, no matter how ridiculous it may seem. So how's that for a "lol"?
Calm down Mr. Serious. Have a beer or something.
16