no. the common parallelogram that looks like a slightly collapsed square/rectangle has angles around 45 degrees.
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A quadrilateral with 4 right angles is a rectangle
yes 4 right angles
No, not necessarily. A parallelogram can have all sides equal, but still not be a square.
A rhombus has 4 equal sides. Its angles can be right angles, but don't have to be. A square is a type of rhombus.
A square, by definition, must have four right angles. A plane shape with 4 right angles which is not a square is a rectangle.