Not normally if it's a regular based pentagonal pyramid.
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If a triangular based pyramid has any right angles it has three. (Think of the corner of a cube). There are many triangular based pyramids that do not have any right angles.
The right angles in a pentagonal prism happen where the long faces meet the pentagonal end-caps. Therefore, there are 10 right angles in the form.
No angles are larger than 90 degrees in a square based pyramid.
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Yes - it has four around the base !
4
There are at least 30 angles between edges in a right pentagonal prism. If the entlgon is regular there are two different vlues for these angles; 90 and 108 degrees.
Normally four but there could be six if the opposite edges at the apex met at right angles.
Yes its base contains 4 corner right angles
There are no right angles (90 degrees) in a hexagonal pyramid.
Just the one and it is the base face