I believe it is called a rectangular prism. A cube would have all edges the same length and all faces the same area
On my cube all edges ARE the same length and all faces HAVE the same area. Therefore it meets your requirements for a cube.
Hey, could you model this? 
Maybe when I'm done with the musket.
But now I would like to address the Blockland Forums community as a whole because I need help with MilkShape.
How do I make things that arn't just the shapes that I can make on the sidebar?