Exchange 2013 sp1 upgrade to Exchange 2016

Hi @Deen Uthman ,
You could use Exchange Deployment Assistant. It could help you evaluate your system and guide you through the steps.
For upgrading from Exchange 2013 to Exchange 2016, we have to install Exchange 2016 firstly to coexist with Exchange 2013. After the configuration and testing in Exchange 2016, we can migrate mailboxes from Exchange 2013 to Exchange 2016.
You need to consider the system requirements needed to install Exchange 2016 and Exchange Server prerequisites
For details, you can refer to this case:
https://social.technet.microsoft.com/Forums/en-US/04f7fcbd-b1cf-4ac5-bfad-168976a0b816/upgrade-exchange-2013-to-2016

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For detailed steps on migrating from Exchange 2013 to Exchange 2016, please follow the guide from Exchange Deployment Assistant.

In general, you need first to install Exchange 2016, have it co-exist with Exchange 2013, then configure settings like SCP, DNS records, and virtual directory URLs to point to Exchange 2016 and migrate mailboxes.
Consider removing the Exchange 2013 server if everything works fine after the migration.