I don't know what the threshold amount is for a W-2G to be issued, or for income to be withheld. A $600 gambling win is not likely to significantly effect your tax burden, but that depends on a lot of details that you don't have here.
Are you planning on doing more gambling before the year is out? If you you rack up gambling losses that can be applied against the winnings in calculating your taxable income. To illustrate:
You have $600 in gambling winnings. Between now and the end of the year you buy $550 worth of scratch-offs, all of which are losers. Then you only pay taxes on the remaining $50 of winnings.
It depends on what the kind gambling is involved. You may find this link helpful:
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