Stamps can be square, rectangular, pennant-shaped or various other shapes - and have been at some time or another, considering all countries in the world. But they are overwhelmingly square or rectangular, yes.
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No. A square is a rectangle, but a rectangle is not a square.
A square is a special rectangle.
A rectangle and a square are different shapes. A rectangle cannot be a square.
it means that a square is not a rectangle
A square is a rectangle.