To determine the product of \( \sqrt{36} \) and \( 12 \), we first calculate \( \sqrt{36} \).
\[ \sqrt{36} = 6 \]
Now, we multiply this result by \( 12 \):
\[ 6 \times 12 = 72 \]
The number \( 72 \) is a rational number because it can be expressed as a fraction (for example, \( \frac{72}{1} \)).
Therefore, the product of \( \sqrt{36} \) and \( 12 \) will result in a rational number.
Final Answer: rational