You can change the predefined formatting options. Here is the link :
EDIT:
I think that I will give Oleg and insert his comment below, in which he really does the work to provide the code from the documentation:
If you redefine $ .jgrid.formatter.integer as the next $ .jgrid.formatter.integer = {thousandSeparator: ""}; you will see all integers in jqGrid, including the full number of records created without spaces as a thousands separator. - Oleg May 20 '10 at 8:52
Thank you Oleg!
Bradley mountford
source share