Do you need PRINCE2 to be a project manager?
No, you you do not need PRINCE2 to be a project manager. However, PRINCE2 certification helps you to learn the PRINCE2 framework which is based upon the most up to date best practices in project management. Learning PRINCE2 will help you to become a better project manager because it is based upon the latest best practices in project management.
There are no prerequisites for taking aPRINCE2 course and whilst working in the project profession is advantageous, it is not a requirement. That's because it helps a project manager understand the decisions that need to be taken on a project, when, and by whom. PRINCE2 can also be applied to any type of project, and of any size.
Therefore project managers would have a better overall understanding of project management best practices if they hold a PRINCE2 certification.