Four. Any less and it wouldn't be three dimensional-- it would be a polygon.
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They are the faces of the polyhedron.
No polyhedron has five sides as a pentagon and a hexagon has six sides
A polyhedron has "many sides" (by definiton). The only 3-D shape which does not have "many sides" is a sphere (which technically only have one "side").
A non polyhedron does not have these properties, maybe it is not closed, maybe one or more of the sides is a curved surface. In some branches of topology the sides of a polyhedron cannot intersect each other.http://wiki.answers.com/What_is_the_difference_between_a_polyhedron_and_a_non_polyhedron#ixzz185DDOyd9
Heptahedron.