No it is not because there is 1,2,4, and 8. It is a composite number.
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The first prime number after 8 is 11
8 is NOT a prime number. It is divisible by 2, for example.
The prime number before 8 is 7.
17 is a prime number. 8 and 12 are not prime numbers.
No. 5 is the third prime number.