The Los Angeles Police Departments says, "The government issued Economic Impact Payment, commonly known as a "stimulus check", is not a check at all. It’s a payment made by direct deposit, from the IRS, into an individual’s checking account. No forms are required, and the Federal government won’t ask payment up front to process the payment. The IRS will simply deposit the money, and they’ve begun this process for many Americans already. Anyone calling, or knocking on your door, regarding your stimulus check is likely an identity thief." Source.
To see if you are eligible, visit the IRS website.