I’ve tried googling but some sources are saying that it is and others are saying it is not.

Public trust is not a security clearance

Public Trust is a type of background investigation, but it is not a security clearance. Depending on the job, you must complete either the Standard Form 85 (SF85) or 85P (SF85P) questionnaire.

Public trust is a security clearance

Most U.S. government jobs and internships in foreign policy, national security, or economic statecraft require a security clearance. Security Clearances fall into three categories: National Security, Public Trust, and Non-sensitive. National Security clearances range from confidential, which is the easiest to attain, to Secret, Top Secret, and SCI, which is the most challenging. Public Trust clearances are either low, moderate, or high risk, and Non-sensitive are the least extensive, requiring only criminal background and credit checks.