The primary difference between a square and a rhombus is a square has four 90-degree angles, while a rhombus does not have any right angles. The sides of a square are perpendicular to one another, unlike the sides of a rhombus.

All the angles of a square are equal. The rhombus has two sets of opposite internal angles with the same measurement.

Both the square and rhombus are quadrilaterals and parallelogramsâ€”they have four sides, and their opposite sides are parallel. The two shapes have all sides equal. Every square, by definition, is considered a rhombus, but a rhombus is not always a square.