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Nine, if the prism has both a base and a top (plus the seven sides). Nine faces is customary for a heptagonal prism (but there are variants ... see below).

If the prism is shaped in the form of a pyramid, then eight. There are seven faces, above the plane, plus its base, making eight total faces. (Hepta- is the Greek root word for the number seven.)

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Q: How many faces does a heptagonal prism have?
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