No shape is a square but not a parallelogram as all squares are parallelograms:
All parallelograms have opposite sides parallel and of equal length, and opposite angles are equal.
All squares have opposite sides that are parallel and of equal length, and opposite angles are equal; thus all squares are parallelograms.
However, all squares also have all angles equal to 90o and all four sides equal, but some parallelograms have angles not all 90o and/or not all four sides of equal length; thus not all parallelograms are squares.
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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.