If you are being prompted for Google Authenticator, it means the system is requiring two-factor authentication (2FA) using a time-based one-time password application. Google Authenticator is one method used to generate these verification codes.
Whether you can skip setting up Google Authenticator depends on the specific platform. Some systems allow alternative verification methods such as SMS codes or email verification, or may allow setup to be completed without enabling an authenticator app immediately. However, many secure systems require 2FA to be enabled before the account can be fully created or accessed.
If you do not have Google Authenticator, you may be able to use an alternative authentication method if the system provides one, or complete account recovery or setup using other verification options.