Yes. And a square is always a rhombus.
Yes- a square is always a special kind of parallelogram.
a paralleogram has four sides
the diagonal in a paralleogram is not equal but the diagonals in the rectangle are congruent this is because the opposite sides of a parallelogram and rectangle are same parallel to each other but the adjacent sides of a parallelogram is not perpendicular where as the adjacent sides of rectangle is perpendicular to each other.
A rectangle is always a quadrilateral and a parallelogram.
A square is always a rectangle. A rectangle is not always a square. And both are quadrilaterals.
No, it is never a rectangle.