To find the product of \(5 - \sqrt{16}\) and \(16\), we first simplify \(5 - \sqrt{16}\):
\[ \sqrt{16} = 4 \]
So,
\[ 5 - \sqrt{16} = 5 - 4 = 1 \]
Now, we can find the product:
\[ 1 \times 16 = 16 \]
Now, we classify the number \(16\). Since \(16\) can be expressed as the fraction \(\frac{16}{1}\), it is a rational number.
Thus the final answer is:
16; a rational number.