They are not always square. Many are hexagonal.
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A henhouse with a hexagon shape was easier to build than a circular one. Most nuts and bolt heads have a shape that is either a square or a hexagon.
is a square a 3d shape
A square is a shape and a shape cannot be invented.
No, a square is not a regular shape. However, it is considered to be an organic shape. Another organic shape is the prism.
There is no simple shape that has exactly 4 square sides.