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N/A - 1999 is a prime number.
No, I don't think the number 1999 has a prime factorization. I think the numberis just prime.
Yes, of 1 since 1 x 1999 = 1999. Other than 1 and 1999, no since 1999 is a prime.
Last prime of the 20th Century was 1999. Last prime of the 21st Century will be 2099.
1999 is prime1999 is already prime.