Primes / Is 3 prime?

Is 3 a Prime Number?

Yes

3 is prime: nothing below 3 needs checking as a divisor, since √3 < 2. 3 sits between primes 2 and 5, 1 below and 2 above. 3 shares no factor with 2-12; 3's divisors start beyond that range. 3 is odd, digit sum 3 for 3, digital root 3 for 3. 3 has 6 primes within 10 of 3.