A rational number is any number that can be expressed as the quotient or fraction of two integers (where the denominator is not zero).
1.345 can be expressed as \( \frac{1345}{1000} \), which is a fraction of two integers, so it is a rational number.
On the other hand, \( 6 - \sqrt{} \) seems incomplete. If it's meant to refer to \( 6 - \sqrt{n} \) where \( n \) is a non-perfect square, then it may not be a rational number. If \( n \) is a perfect square (e.g., 4), then \( \sqrt{n} \) would be an integer, making \( 6 - \sqrt{n} \) a rational number as well.
Without further clarification on \( 6 - \sqrt{} \), we cannot definitively assess if it’s rational or not. However, since 1.345 is clearly a rational number, the answer is:
1.345.