"Apple" just called me to tell me my iCloud account was hacked, this is a scam right?

Apple does not make such calls.

The callers are criminals trying to steal your personal and financial information. They use number spoofing to pretend to be calling from a legitimate number.

Avoid phishing emails, fake 'virus' alerts, phony support calls, and other scams - Apple Support

You’re welcome.

No further steps are required, as the calls are complete nonsense. Simply hang up on them.