To determine if 1999 is a prime number or a composite number, we simply look at the factors for 1999.
If the factors of 1999 are only 1999 and 1, then we know that 1999 is a prime number. Otherwise, 1999 is a composite number.
To explain better, if 1999 is only divisible by 1 and 1999, then it is a prime number, and if 1999 is divisible by more than 1999 and 1, then it is a composite number.
The factors of 1999 are as follows:
1, 1999
Therefore, since 1999 is divisible by only one and itself, the answer to the
question "Is 1999 prime or composite?" is highlighted in blue below.
prime
Is 2000 prime or composite?
OK. Now you know that 1999 is a prime number. Use our logic above and see if
you can figure out if the next number on our list is prime or composite before you check your answer.
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