Primes / Is 1 prime?

Is 1 a Prime Number?

No

1 is not prime: primality starts at 2, and 1 sits below that threshold (1 has exactly one divisor, itself, so it's neither prime nor composite). 1 has no prime below it; the next one up is 2, 1 away. 1 shares no factor with 2-12; 1's divisors start beyond that range. 1 is odd, digit sum 1 for 1, digital root 1 for 1. 1 has 5 primes within 10 of 1.