$\text{Volume}=\frac{1}{3}\left(\text{volume of the corresponding prism}\right)$

$\frac{1}{3}\left(\text{number of cubes in the bottom layer}\right)\left(\text{number of layers}\right)$

$\frac{1}{3}\left(l\right)\left(w\right)\left(h\right)$

$\frac{1}{3}\left(6^2\cdot4\right)$

$\text{Surface Area} = 4\left(\text{area of triangle}\right) + \left(\text{area of base}\right)$
You will need to find the slant height of the pyramid.

$96$ square units