At least 4 - on the four corners of the base. But there could be two more if the opposite pairs of sloping edges met at the apex at right angles.
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a hexagonal prism has exactly 24 right angles!!!
A triangular prism can have right angles. If the prism has two triangular ends, then each of the three 'sides' meets each of the ends at right angles.
i think a octagonal prism has 32 right angles! :)
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There are no right angles in a square based pyramid, so Pythagoras and his theorem are not involved.