Unless you're trying to round the number to the nearest multiple of 108...
to not print if it's zero, try this:
iif (Int([QtyOrdered]/108)*108 = 0, "", Int([QtyOrdered]/108)*108)
By the way, if you're basing your report on a query, it might be easier to include the calculation in the query, e.g.
BatchCount:Int([QtyOrdered]/108)*108
iif ([BatchCount] = 0, "", [BatchCount])