Always. In fact, one method of proving a quadrilateral a rhombus is by first proving it a parallelogram, and then proving two consecutive sides congruent, diagonals bisecting verticies, etc.
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Well a rhombus is sometimes and square. but a square is always a rhombus
Always: that's what makes a rhombus a rhombus. A+ Homies
always
because the sides never touch each other except at the corners.
A square does indeed fit the definition of a rhombus if you defined it as any parallelogram with equal sides. A rhombus can also be defined as a parallelogram with opposite equal acute angles and opposite equal obtuse angles, and four equal sides. This definition does not allow for a square.