i assume you mean you have 2fa enabled and your mobile is alerting you that someone's trying to log into adobe.com and asking you for authentication. (and you have the adobe authenticator app on you mobile.)
if so, you can't tell from adobe's end. does anyone else have physical access to a computer you've used in the past to sign into adobe.com?
and your password should be a combination of lower case and upper cass letters, numbers and symbols and should be about 10+ charactors in length and should NOT be stored on your computer, if others have access.