Where can i find my at&t prepaid account number ?

where can i find my account number for at&t prepaid mobile ? is it just my phone number? my kids have prepaid and my husband and i have regular cellular service though at&t , when I log into my regular at&t account i can see my account number but when I log into at&t prepaid there is no account number . im trying to transfer there phone numbers over to a new provider . can anyone help me with this issue? I would really appriciate it , thank you in advance.