This number has called me a few times claiming they have Federal grant money. Once I question this they hang up. There is also a lot of back ground noise on the caller's end like he is calling from a Mall.

I know how you feel. He said the same thing to me and it was very loud in the background as well. When I tried calling back it said the number was not in service.

THEY CALLED ME CLAIMING TO GIVE ME A PAY DAY LOAN THAT I DIDNT APPLY FOR, FOR $1000 AND THEY WANTED ME TO GO TO WESTERN UNION TO SEND THEM MONEY AND I HUNG UP... THEY CONTINUE TO CALL NON-STOP.

omg i gave them my account number will they be able to do something with it

Yes - alert your financial institution