If a brick is made from a natural occurring matter such as chiseling a stone into the shape of a brick, then maybe. If it is clay/mudd that is heated into the shape of a brick, then maybe not
For strength of brick constructions it is useful to have them partially overlapping. A rectangular shape makes it easier to have them partly overlapping.
The first Lego brick was a 4x2 white Lego!
he most common shape is a rectangular prism.
Because it's shape is somewhat resembles a frog.
An example is in brick-making. Pliable clay is formed into brick-shape, and put into a kiln. When the brick is removed from the kiln, it is a solid brick.
A box or smooth brick.
A smooth brick.