you can do a totext process and convert it back to a number but it seems a waste.
I would not assume that the fomrula is the issue and try first to just enter the data straight up to test and make sure that part is working.
enter
10981000 intot he run time param
and in the select statement use
{?Client ID} = {Employee_job_History_SCD.Client_ID}
Did you get the record you expected?