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It has 4 corners.
Four. Three corners to the base and the apex.
If you mean the base has 4 sides then the pyramid is a square based pyramid and has 5 corners. If you mean the pyramid has 4 faces then the pyramid is a tetrahedron with a triangular base and has 4 corners.
A square based pyramid has 5 corners - 4 for the square and 1 for the top of the pyramid.