It has 5 flat faces because there are 4 flat faces at the top and 1 flat face at the bottom.
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A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.
a pyramid with a triangular base has 4 faces. a pyramid with a square base has 5 faces.
If you mean a tetrahedron then it is a triangular based pyramid with 4 flat faces
Four(4). It is formally named as a 'tetrahedron'. There is the triangular base ; one side. and three triangular faces m aking for a total of four faces. A square based 'pyramid' is formally a 'pyramid'. A square base and four triangular faces.
A square based pyramid