Since there was a featured that was requested for addition of

isISO6391()

I also feel that we can add

isISO6292()

Reference: https://en.wikipedia.org/wiki/ISO_639-2

For more ISO 693 you can refer to https://en.wikipedia.org/wiki/ISO_639

Cc. @profnandaa, let us have your view on this feature and other ISO 639 features.