Custom order number extension for Magento 2 helps admin to customize default IDs of Order, shipment, invoice and credit memo by adding prefixes and suffixes.
Admin can customize order increment IDs using prefixes and suffixes. Admin can also customize shipping, invoice, and credit memo IDs. Customize the length of the number. Customize the starting order number. Use a customized numbering system to protect sensitive business data. Set the custom numbering system as per country code. To give a professional look to order numbers instead of the traditional numberings system.
For more detail about This extension click here: Custom order number Extension