You can find your loan number on your first payment letter or payment coupons, which were both included in your final loan documents.
You can find the loan number here:
Image of sample IRS 1098 form
You will receive your 1098 form in the same way you receive your statements.
If you receive your statements by mail or email, look for your 1098 in the same manner. If you're not sure, or want to reach out to your servicer, please enter your loan number in the box at the top of the page to get automatically redirected to your servicing portal.
