java.util.UUID.randomUUID().toString() length

Does java.util.UUID.randomUUID().toString() length always equal to 36?

I was not able to find info on that. Here it is said only the following:

public static UUID randomUUID() Static factory to retrieve a type 4 (pseudo randomly generated) UUID. The UUID is generated using a cryptographically strong pseudo random number generator. Returns: A randomly generated UUID

And that type 4 tells me nothing. I do not know what type 4 means in the case.