No because it has more than 2 factors so it is a composite number
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168 84,2 42,2,2 21,2,2,2 7,3,2,2,2
No, it is composite. All numbers except 2 are composite because 2 will divide into them.
If the question refers to the prime factors of 999 then these are 33 and 37. If the question refers to the number of prime numbers between 1 and 999 then there are 168.
No.
168