A cube has 4 flat surfaces (called faces) and 6 vertices (or corners).
rectangular prism
A square has 4 flat surfaces.
A tetrahedron is a solid figure with four flat surfaces that are triangles. Each face of a tetrahedron is a triangle, making a total of four triangular faces in the shape.
Triangular prisim
A triangular based pyramid would fit the given description.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
square
There are 4 corners in a flat rectangle and 8 corners in a 3d rectangle(rectangular prism).Four.
The question is somewhat confused. It has "... 6 flat SQUARE faces 2 are SQUARE and 4 are RECTANGLES ...." Assuming the first part is wrong, the shape is a cuboid.
rectangle
A square or quadrilateral.