A pentagonal prism.
A cuboid.
The solid shape that has six rectangles is called a rectangular prism, or a cuboid. This three-dimensional shape has six faces, each of which is a rectangle, and its opposite faces are congruent. Rectangular prisms can vary in dimensions but always maintain right angles between adjacent faces.
A rectangular prism.
Cuboid
cube
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A rectangular prism.
A hexahedron, or cube.
Hexahedron
A cuboid.
A pentagonal prism.
A cuboid.
A pentagonal prism
A rectangular prism is a hexahedron with some rectangular sides. There is no requirement that all sides be rectangles. If they are, the solid is a right rectangular prism, or cuboid.
The solid is a cuboid, or "right rectangular prism" in which all angles are right angles. It is a box shape, or regular hexahedron.