Because the literal meaning of polyhedron means 'many faces' A sphere has only one face.
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No, a sphere is not a prism. A prism is a polyhedron with two parallel and congruent faces called bases, and all other faces are parallelograms. A sphere, on the other hand, is a three-dimensional geometric shape with all points on its surface equidistant from its center, with no faces, edges, or vertices. In essence, a sphere is a curved surface while a prism is a polyhedron with flat faces.
A polyhedron can have any number of faces 4 or higher.
Tetrahedron
Face
nonahedron