A rhombus prism has 6 faces. Any or all of them could be considered bases.
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Each and every prism has two parallel congruent bases. It is the shape of these bases that give the name to the prism: a pentagonal prism has pentagons (not necessarily regular) for its bases.
It has 4 bases.
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges.
A rhombus has 4 vertices, therefore a rhombic prism has 4 x 2 = 8 vertices.
8