A square.
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A rectangle having all four sides as an equal single length is a square.
A rectangle is a square when all four of its sides have equal length.
All four sides of a square are equal in length. Only the opposite sides of a rectangle are the same length. The adjacent sides are different in length.
a rectangle is not a square by a square having parallel sides for all but the rectangle only has one pair of parallel sides * * * * * Actually, a rectangle has two pairs of parallel sides - the same as a square. Where they differ is that a rectangle has two pairs of sides of equal length, but each pair is different from the other. In a square, all four sides are of equal length.
When all the vertices of a plane quadrilateral are exactly equal to 90 degrees it is is called a rectangle and, if all its sides are of equal length, that rectangle is called a square. So when a plane quadrilateral has all its vertices exactly equal to 90 degrees, but it does not have all its sides equal in length, it must be a rectangle but not a square.