Rectangular Phases in a Cuboid:
A cuboid has 6 rectangular faces - 4 lateral faces and 2 bases. The lateral faces are parallelograms, while the bases are rectangles. Each face of the cuboid is a rectangle, making a total of 6 rectangular faces.

Possibility of a Cuboid Having a Square Shape:
A square is a special type of rectangle where all four sides are equal in length and all angles are right angles. In a cuboid, it is not possible for all faces to be square because a cuboid has three pairs of opposite faces that are equal in size and shape. However, it is possible for a cuboid to have square faces as long as at least two pairs of opposite faces are squares.
For example, a cube is a special type of cuboid where all six faces are squares. This means that a cube is a type of cuboid where all sides are equal in length and all angles are right angles. So, while it is not possible for a general cuboid to have all square faces, it is possible for a cuboid to have square faces if at least two pairs of opposite faces are squares.