Final answer:
A square has a maximum of four lines of symmetry, including two diagonal lines and two lines that divide the square through the center horizontally and vertically.
Step-by-step explanation:
The maximum number of lines of symmetry a square has is 4. The lines of symmetry in a square are the lines that divide the square into two identical parts, where one part is the mirror image of the other. A square has two lines of symmetry that run diagonally from one corner to the opposite corner, and two lines that cut the square in half horizontally and vertically through the center of the shape.