Nope, sorry, Prador Moon is the first book chronologically.
Most of his Polity books are listed in this post here (there are a couple of more recent ones missing)
Neal Asher books: In what order should I read?
Which shows the chronological order as well as publishing dates. Generally speaking the individual sub-series are pretty stand alone. So you could read the Spatterjay books before the Agent Cormac ones. However The Technician and the newer Transformation books (there are two more not show here) do really follow on from the Cormac books.
Personally I'd recommend you read in chronological order or maybe publication order.