It is a closed geometric figure so so contains space within it.
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A quadrilateral and a rectangle are the same so.............
A square is a rectangle in which all the sides are the same length.
A rectangle is a 2-dimensional shape. Its equivalent in 3-dimensions is a cuboid. The equivalent of a cuboid in 4 or more spatial dimensions is a hyper-cuboid.
Every square is a rectangle because a rectangle is a polygon with 4 sides (a quadrilateral) and 4 right angles. A square is a rectangle with 4 equal sides. So the thing that would makes some rectangles not like squares is they have only two sides of equal length and not four.
All four of the angles of a rectangle (and of squares) are right angles.(Its name comes from this : rect-angle.)