Report Abuse. pi is an irrational number. it goes out to an infinite number of decimal places and they never repeat. this is the definition of an irrational number. a rational number, if it did not terminate at some decimal place, would at least have repition such as 1/3=.33333... or 1/6=.1666...ll rational numbers can be represented exactly as a ratio of integers or, equivalently, as a repeating decimal. For example, one half is rational since it can be expressed exactly as either 1/2 or as 0.5000000....