The answer will depend on the area of the base, whether or not it is a right pyramid, and its height.
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It is: base area+(4*triangle areas)
The volume for any pyramid = 1/3*base area*perpendicular height
Square base with 5 sides. Formula for area: 1/3(area of the base)(height)
You did not give the height of the pyramid and 16 cm is not an area, but the area of the face would be one half the face height of the side of the pyramid times the length of the base side.
Volume of a pyramid = 1/3*base area*height