The volume \( V \) of a cube can be calculated using the formula:
\[ V = s^3 \]
where \( s \) is the side length of the cube.
Given that the side length \( s \) is 1.5 inches, we can substitute this value into the formula:
\[ V = (1.5)^3 \]
Calculating \( (1.5)^3 \):
\[ (1.5)^3 = 1.5 \times 1.5 \times 1.5 \] \[ 1.5 \times 1.5 = 2.25 \] \[ 2.25 \times 1.5 = 3.375 \]
Therefore, the volume of the cube is:
\[ V = 3.375 \text{ in}^3 \]
So, the volume of the cube with a side length of 1.5 inches is \( \boxed{3.375} \) cubic inches.