It can but that's not necessary. If it has, then
that rhombus is commonly called a "square".
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a rhombus is a parallelogram with no right angles.
Yes a square always has 4 right angles but a rhombus never has any right angles.
If the rhombus is a square, it has 4 right angles. otherwise, no.
A rhombus has no right angles at its vertices but its diagonals are perpendicular to each other forming 4 right angles.
A rhombus has 4 equal sides but no right angles whereas a square has 4 equal sides and 4 right angles.