In languages it is possible for one century to be a yewa shorter than all the others. Other centuries begin on a year divisible by hundred, but centuries 1–99 and -1–-99 don’t. They are both missing a year, and outside mathematics that’s just fine.
If almost all native speakers of a language say that a century begins in a year divisible by hundred then that’s how it goes in that language.
Mathematics and languages have different rules.
In languages it is possible for one century to be a yewa shorter than all the others. Other centuries begin on a year divisible by hundred, but centuries 1–99 and -1–-99 don’t. They are both missing a year, and outside mathematics that’s just fine.
If almost all native speakers of a language say that a century begins in a year divisible by hundred then that’s how it goes in that language.