I forgot apple id and also don’t remember my used number but do have gmail account password of used apple id.. can i recovery my apple id through gmail?

See if you can recover the ID. Use every email address you can think of.

Apple ID - How to find your Apple    An iCloud e-mail address is an Apple ID.

Apple ID - Find              

To start account recovery you will need to know that trusted phone number you used. It’s a security feature so until you can figure it out you won’t be able to reset your password. Check with friends, family, carriers, etc.