three
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The answer will depend on whether the hexagons are all the same size or not, whether they come together in a plane or 3-dimensions, whether they can join at vertices or only sides. Two hexagons, of the same size, that are coplanar can make a concave hendecagon (meet at side) or a concave dodecagon (meet at vertex). Two concave hexagons can also join (dovetail) to make one hexagon. The question is under-specified.
It is a pyramid
A vertex is a point, so one.
One hexagon has six sides, so 100 hexagons have 600 sides.
it has one vertex two circle edges and one face