Yes, 5/2 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 5/2, the number 5 is the numerator (an integer), and 2 is the denominator (also an integer and not zero). Therefore, since it can be expressed in this form, 5/2 qualifies as a rational number. Additionally, when you divide 5 by 2, you get 2.5, which is a finite decimal, further confirming that it is indeed a rational number.