Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Some Kindle models can have 'Silk' (the operating system on the Kindle) store or save passwords for various functions.
Whether this covers the main Kindle's password ***** ***** question... but it might be possible.
Would you like to try that? if so, let me know, and I will give you instructions.