The volume of a pyramid is given by the formula:
\[ V_{\text{pyramid}} = \frac{1}{3} \times B \times h \]
where \( B \) is the area of the base and \( h \) is the height.
Given that the volume of the pyramid is 210 cubic units, we can express the area of the base and height in terms of this volume:
\[ 210 = \frac{1}{3} \times B \times h \]
To find the volume of the prism, we use the formula for the volume of a prism:
\[ V_{\text{prism}} = B \times h \]
Now, we can relate the volumes of the pyramid and prism. From the pyramid's volume formula:
\[ B \times h = 3 \times 210 = 630 \text{ cubic units} \]
Thus, the volume of the prism is 630 cubic units.
So, the answer is:
630 cubic units.