The numbers on the England Cricket shirts below the 3 lions relate to their cap number, These differ depending on if its Test Matches or ODI matches
Andrew Struass is 624 for Test Matches and 180 for ODI and 9 for T20
http://www.ecb.co.uk/news/england/england-player-numbers,321,BP.html
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These numbers; found on the cap, shirts and jumpers of the players, shows how many players have played for England including himself, when they make their debut. For example, if Ian Bell had number 600 (if he does, it was a good guess), then it would mean he was the 600th different player to play for England.
Its the cap number, representing players that reach the national level.
e.g. Andrew Flintoff is the 591st cricketer to play for England, so his cap number is 591, and this is the number displayed on his kit.
A full list of cap numbers can be found here..
http://en.wikipedia.org/wiki/List_of_England_Test_cricketers