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It's almost certainly just worn. Compare its diameter to a quarter that still shows reeding. It'll probably be just a fraction of a mm. smaller due to wear.
Yes, of 1 since 1 x 1999 = 1999. Other than 1 and 1999, no since 1999 is a prime.
1999 + 1000 = 2,999
1999 is prime1999 is already prime.
N/A - 1999 is a prime number.