Yes if it has a unified hexagonal cross-section
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It can be but it need not be. It can be a pentagon-based pyramid or a triangle based bi-pyramid.
No, it is not.
A rectangular prism or a hexahedron.
Some hexahedra are prisms or pyramids.
A hexahedron is a 3D shape with 6 faces. It CAN be a prism whose base is a square. But that is only one example. It can also be a prism whose base is any quadrilateral. It can also be something like a pentagonal pyramid (i.e. the base is a pentagon and the sides are made up of 5 triangles.)
Yes, but only if one face of one prism is congruent to a face of the other.