Primes / Is 23 prime?

Is 23 a Prime Number?

Yes

23 is prime: for 23, testing every prime up to √23 ≈ 4.8 (namely 2, 3) finds no divisor. 23 sits between primes 19 and 29, 4 below and 6 above. 23 shares no factor with 2-12; 23's divisors start beyond that range. 23 is odd, digit sum 5 for 23, digital root 5 for 23. 23 has 6 primes within 10 of 23.