Yes, 6 is a rational number.
A rational number is defined as any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero. In this case, the number 6 can be expressed as the fraction 6/1. Here, both 6 and 1 are integers, making the fraction a valid representation of a rational number.
In general, all whole numbers, including zero and negative numbers, are considered rational because they can be written as a fraction. Therefore, since 6 fits this definition, we confidently conclude that it is indeed a rational number.