Shapes have sides. Do you mean, what shape has 6 sides or, what solid has 6 faces?
a square
A rectangular prism has 6 faces.
It is a cube.
Cube
Shapes have sides. Do you mean, what shape has 6 sides or, what solid has 6 faces?
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a square
cuboid
A rectangular prism has 6 faces.
A rectangular prism.
Shape
It is a cube.
A cube has 6 faces
You usually get the part of the word that means the particular number and put it before hedron (for solid shapes). E.g. Because a pentagon has 5 sides and a hexagon has 6 sides, "penta" means 5 and hexa means 6. Going by this rule, you can have hexahedrons, heptahedrons, octahedrons, nonahedrons, decahedrons, etc. for 6, 7, 8, 9 and 10 faced solid shapes respectively.
Well, honey, the 3D shape you're looking for is a cube. It's got 6 square faces and 2 rectangular faces, making a grand total of 8 faces. So, if you're ever in a geometry showdown and someone asks you this question, you can confidently strut your stuff and say, "It's a cube, darling."
A cube