A rectangle or a square.
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Not necessarily, but it can.
A parallelogram has 0 or 2 acute angles. If the parallelogram happens to have four right-angled corners, it is still a parallelogram (and a rectangle), but no acute angles.
If it has four 90 degree angles, than it's a square, and therfore only has four angles.
Four 90 degree angles.
A square has four 90 degree angles.