TBF, if your goal is to generate the most valid sentence that directly answers the question, it's only one minor abstract noun that's broken here.
Edit: I wouldn't be surprised if there's a substantial drop in the probability of a digit being listed after the leading 9 (3.14159...), even, so it is "last" in a sense.
Edit again: Man, Baader-Meinhof so hard. Somehow pi to 5 digits came up more than once in 24 hours, so yes.
I'm kind of curious what ways exactly using this in place of actual pi would change/break geometry. Obviously, it wouldn't become noticeable until you try to involve infinite structures.
There's probably some finetuning at play for Amazon's thing which makes it tend to always give a straight answer, instead of stepping outside of the box and doing something like correcting an implicit assumption.