Yes. 4xx codes are client errors: The request contains a mistake or can't be fulfilled as sent.

4xx · Client error

HTTP 425 Too Early

The server won't risk processing a request that might be replayed (TLS early data).

Example response

HTTP

HTTP/1.1 425 Too Early
Content-Type: application/json; charset=utf-8

{ "error": "Too Early" }

Look up the headers shown here in the HTTP headers reference.

What does HTTP 425 mean?: Too Early. The server won't risk processing a request that might be replayed (TLS early data).
Is 425 an error?: Yes. 4xx codes are client errors: The request contains a mistake or can't be fulfilled as sent.