Del. Code tit. 30, § 2101

No person shall engage in or carry on any trade or business for which a license is required by this part without first having obtained a license therefor from the Department of Finance and paid therefor the fee or tax prescribed in this part. The provisions of §§ 516(g) and 2216 of Title 13 shall apply and supersede any license requirements of this part with respect to matters involving any applicant or licensee under § 516(g) or § 2216 of Title 13. The Department shall forthwith deny the issuance or renewal of any license under this part, or suspend the same, upon receipt of notification from the Family Court pursuant to § 516(g) of Title 13 or notice from the Director of the Division of Child Support Services pursuant to § 2216 of Title 13 regarding an applicant or licensee. The Social Security number of the applicant shall be included on the application for issuance or renewal of any license under this part.