Ah, another "numerology" thread. I'm always bemused at the joy or the consternation people get out of numbers.
As for trademarking numbers, that's not allowed in the US at least and maybe elsewhere too. Intel tried to trademark 586, after it was mad at AMD for selling a 486 part, but it was not allowed. Thus Intel gave a bazillion dollars to some branding consultant who came up with "Pentium". It seems to me that this was the point where the whole mania for branding really took off.