To rewrite the irrational number \( \sqrt{63} \) as the product of an integer and another irrational number, we can first factor 63. The prime factorization of \( 63 \) is:
\[ 63 = 9 \times 7 \]
We know that \( 9 \) is a perfect square. Therefore, we can write \( \sqrt{63} \) as follows:
\[ \sqrt{63} = \sqrt{9 \times 7} = \sqrt{9} \times \sqrt{7} \]
Since \( \sqrt{9} = 3 \), we have:
\[ \sqrt{63} = 3 \times \sqrt{7} \]
Thus, \( \sqrt{63} \) can be rewritten as the product of an integer and another irrational number in simplest form as:
\[ \sqrt{63} = 3\sqrt{7} \]
Here, \( 3 \) is the integer and \( \sqrt{7} \) is the irrational number.