Shapes have sides. Do you mean, what shape has 6 sides or, what solid has 6 faces?
it is called a isosceles shape if iT only has 2 sides that have the same exact length
A kite or arrowhead.
A four-sided shape with only 2 sides the same length is called a rhombus.
the correct classification of a cube is that a cube has six sides and all the faces are the same length and shape a cube is like a dice in monopoly it has six sides that are all of the same length height and base.