I think it is "quadrangle". If it has 4 equal sides and 4 right angles, "square" is right.
A cuboid or a rectangular prism.
a prime square
It is known as a regular polygon
a square
I think it is "quadrangle". If it has 4 equal sides and 4 right angles, "square" is right.
A square pyramid.If you would like to be abstruse you could call it the first Johnson solid (a non-uniform convex polyhedron).
Reuleaux triangle
A cuboid or a rectangular prism.
a prime square
It is known as a regular polygon
Square.
It has 3 sides.
a square
A Square :)
Square
Square