Yes, 64 is a rational number.
By definition, a rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero. In the case of 64, it can be represented as the fraction 64/1. Here, both 64 (the numerator) and 1 (the denominator) are integers, and since the denominator is not zero, this confirms that 64 is indeed a rational number.