If the question is about a plane shape with exactly 3 right angles it could be an irregular polygon of 5 or more sides. If the shape can have more than 3 right angles then a square or rectangle are also possible.
Finally, in 3 or more dimensions, a polyhedron with any number of faces can have 3 or more right angles.
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No because a parallelogram in the shape of a rectangle has 4 right angles
You can make a four sided shape with 3 right angles, but it must have another right angle, too. So technically, yes.
you cannot make a regular shape which has 3 right angles only, you will always end up with 4 right angles
A irregular hexagon
A heptagon.