To find the volume of the prism, we can use the formula:
\[ \text{Volume} = \text{Base Area} \times \text{Height} \]
First, we need to calculate the area of the parallelogram base.
The area \(A\) of a parallelogram is given by:
\[ A = \text{base} \times \text{height} \]
In this case, the base of the parallelogram is 9 cm, and the height (perpendicular to that base) is 4 cm. Thus, we can calculate the area as follows:
\[ A = 9 , \text{cm} \times 4 , \text{cm} = 36 , \text{cm}^2 \]
Next, we can calculate the volume of the prism using the area of the base and the height of the prism (18 cm):
\[ \text{Volume} = 36 , \text{cm}^2 \times 18 , \text{cm} = 648 , \text{cm}^3 \]
Therefore, the volume of the prism is:
\[ \boxed{648 , \text{cm}^3} \]