Primes / Is 197 prime?

Is 197 a Prime Number?

Yes

197 is prime: for 197, testing every prime up to √197 ≈ 14.0 (namely 2, 3, 5, 7, 11, 13) finds no divisor. 197 sits between primes 193 and 199, 4 below and 2 above. 197 shares no factor with 2-12; 197's divisors start beyond that range. 197 is odd, digit sum 17 for 197, digital root 8 for 197. 197 has 4 primes within 10 of 197.