YES! the number pi is endless
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No. 81 is a rational number. An irrational number is a number with an endless amount of digits like pi or the square root of 2.
(pi) itself is an irrational number. The only multiples of it that can be rational are (pi) x (a rational number/pi) .
Pi is irrational.
None, the Number Pi is nothing to do with seconds (time).
Pi rounded to the nearest whole number is 3.