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Kytten
2.5 because rational numbers can be written as fractions, but integers written as fractions have to be able to be written over 1. For example 3 is an integer because 3 = 3/1. But 2.5 isn't an integer because 2.5 = 5/2.
AL2006

3.1416 is a rational number.

It can be written as       31,416 / 10,000 .

Since you can write it as a fraction with whole numbers, it's rational. 
That's actually the definition of a rational number.
 
==> ANY number that you can write down completely
using digits is a rational number !

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