Primes / Is 181 prime?

Is 181 a Prime Number?

Yes

181 is prime: for 181, testing every prime up to √181 ≈ 13.5 (namely 2, 3, 5, 7, 11, 13) finds no divisor. 181 sits between primes 179 and 191, 2 below and 10 above. 181 shares no factor with 2-12; 181's divisors start beyond that range. 181 is odd, digit sum 10 for 181, digital root 1 for 181. 181 has 4 primes within 10 of 181.