A rectangular prism is a box-shaped object. It has six flat sides and all angles are right angles. And all of its faces are rectangles. It is also called a cuboid.
If at least two of the lengths are equal then it can also be called a square prism or square cuboid.

If all three lengths are equal it can be called a cube and each face will be a square. A cube is still a prism. And a cube is one of the Platonic Solids.

If the dimensions of a rectangular prism are a, b and c, then its volume is abc and its surface area is 2ab + 2bc + 2ac.

More information at Wikipedia: Cuboid

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