Pi is not a natural number. Natural numbers are just the regular set of numbers used for counting (1, 2, 3, 4, ...). Pi, being not even a whole number, is not natural.
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YES! the number pi is endless
(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).
No, Only natural numbers can be prime.