CONCATENATE QUESTION

I have a column that has number values in it, and I use a custom format of  '00000000000'
this forces all of the values in the column to be displayed as ten digits.
example.
value of 77777 will be displayed as 0000077777

in the cell beside it I need a concatenate formula that will display

select * where acctno = 0000077777

my concatenate formula is
=concatenate("select * where acctno = ",A2)
unfortunately, my result is

select * where acctno = 77777


how do I get the result
select * where acctno = 0000077777