What is a square?

Answer 1

a square is a 2 dimensional plane figure shape that has 4 sides and corners. It has four sides of equal length and four 90 degree corners

A square is a geometric shape who's shape consists of 4 sides of equal length, causing each angle to come to 90 degrees. A square is also a craft/drawing tool similar to a ruler that comes to a 90 degree angle used to measure and/or mark materials for work.
It is a 4 sided quadrilateral whose sides are equal and its 4 interior angles each measure 90 degrees

Answer 2

It is a 4 sided polygon with all sides of equal length and all angles equal to 90 degrees.