a cube.
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rectangular prism
a square pyramid has 5 faces and a rectangular prism has 6
A parellelepiped (pronounced parellel pie ped) is any shape with 6 faces and 12 edges. A cuboid, also called a rectangular parallelepiped, is a parallelepiped of which all faces are rectangular. A cube is a cuboid with square faces. A rhombohedron is a parallelepiped with all rhombic faces. A trigonal trapezohedron is a rhombohedron with congruent rhombic faces. http://commons.wikimedia.org/wiki/File:Parallelepipede.png
A cube is a prism. A cube is another term for a square prism, that makes cube a prism. Others call it special because a cube has 6 square and sometimes equal sides/faces.
A square prism (assuming the 2 squares are among the 6 rectangular, not additional to).