It's a 2D shape.
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It is a 3 dimensional shape
No, a square is a 2d shape, although a 3d shape can be made using multiple squares at different angles than 180 or 0 to each other.
A 2d shape is a flat object (ex: square, circle, etc.) and a 3d shape is a shape in space (ex: cube, sphere, etc.)
a pyramid is a 3D shape :)
Paper is a 3D object.