Primes / Is 211 prime?

Is 211 a Prime Number?

Yes

211 is prime: for 211, testing every prime up to √211 ≈ 14.5 (namely 2, 3, 5, 7, 11, 13) finds no divisor. 211 sits between primes 199 and 223, 12 below and 12 above. 211 shares no factor with 2-12; 211's divisors start beyond that range. 211 is odd, digit sum 4 for 211, digital root 4 for 211. 211 has 1 primes within 10 of 211.