The lowest number of a user that I can find that is a person is an EA employee who has the user number 4:
https://forums.battlefield.com/en-us/profile/EA_Sylent
That would be an EA employee who created these forums and was the first one to sign into them thus giving him or her the number 2 here.
507
I dont know why, but that number looks very familiar
it’s the thread number you kek
Avarik
30
Damn…even you beat me.
#14.
(*´ ; ω ; )/`
483 also a early bird I would say.
Pretty much all of you are early birds. 
so were gonna be strong falcons when the new birds arrives
How do you find out? I’m on mobile
Anyone who has a number higher than 1000 I no longer counts as a Forumfielder
I am number 877 what’s my prize?! 
^ the joy of being number 877.
944
Although it dosent show on mobile had to switch to the full site