英語(영어)의 境遇(경우), 確實(확실)히 “number”는 數字(숫자) 以外(이외)도 包含(포함)할 수 있다는 느낌이 있지요. 實際(실제)로 《위키낱말辭典(사전)》 英文板(영문판)에서 “number”를 찾아보면…

A sequence of digits and letters used to register people, automobiles, and various other items.

Her passport number is C01X864TN.

라는 用例(용례)가 나와 있기도 하고요.

https://baram.me/@bori/114056446388564683

@hongminhee @bori yeah, that's correct — if we want only mathematical numbers it'd be common to say digits instead, though that can also refer to your fingers. Sorry, English is a mess.