i received a call from this number offering me a job

I've also received a phone from this number and an e-mail offering me a job in Alaska with Haliburton.

is he serious or not or fake call

Sorry, but legitimate employers don't offer people jobs, sight unseen.  This is what the Government says about how you can tell if the offer is a scam:

http://www.consumer.ftc.gov/articles/0243-job-scams