What is "Yerkish"? Is it really a language? If so, why? If not, why not?

Question

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The Answer is Yerkish was a computer-based system that was used to teach Lana the chimp to communicate. The keyboard was composed of nine stimuli and nine colors that could be combined into 1,800 lexigrams. I believe it was a language in that it allowed for communication between the chimp and her caregivers. Additionally, Lana's offspring learned Yerkish by watching his mother much in the way children acquire language.

What Is "Yerkish"? Is It Really a Language? If So