As Tim starts to cut the piece of wood for the base of the birdhouse, he finds that the size of bird he wants to attract to the birdhouse needs to make a nest that is up to 64 square inches. Tim thinks the sides of the base of the birdhouse should be 32 inches by 32 inches. His caretaker notices Tim's mistake and asks him to review squares and square roots before cutting the piece of wood.


Explain what mistake Tim made when he got the number 32.