Is the sentence grammatically correct -it has green colour?

The sentence "It has green color" is grammatically correct, but it's a bit awkward. Here's why:

* Redundancy: "Color" is already implied in "green."

* More natural phrasing: A more natural way to say this would be "It is green."

You could also use a more descriptive adjective, like "It's a vibrant green" or "It's a deep green."