If he was borned in Hawaii and started school there, he’d have a Hawaii SSN, wouldn’t he
I’m not sure at what time the SS# requirement came into being for non working youngsters.
I got mine and parents used it for school registration decades before obama was born
I had to get a SSN in 1962 when I was in the fourth grade. Can’t remember why. I still have the card I signed not too long after I learned how to write cursive!