There is no solid shape with exactly four squares and no other faces.
a Stengel!
A bigger square!
quadrilateral(squares,rectangles,diamonds,etc.)
rectangles and squares have
A tetramino is a shape which is formed by four identical squares.
A quadrilateral, which includes squares, rhombi, parallellograms and trapezia...
Any rectangle (including squares).
Rectangular prism
A cuboid or a rectangular prism.
Squares and rectangles have a two-dimensional shape with four sides and four right angles.
Rectangle (squares too)
A "six sided shape" is a hexagon. The solid formed by 6 squares is a cube (four sides, top, bottom).