My 1099K from Square for credit card payments. This income is in Quickbooks which was transferred to Turbo Tax. Do I have to list my 1099K from Square?

No, you do not need to enter your Form 1099-K from Square if the income was already included in the amount transferred from Quickbooks to TurboTax.   If you entered the Form 1099-K, you would be doubling that income.