Primes / Is 491 prime?

Is 491 a Prime Number?

Yes

491 is prime: for 491, testing every prime up to √491 ≈ 22.2 (namely 2, 3, 5, 7, 11, 13, 17, 19) finds no divisor. 491 sits between primes 487 and 499, 4 below and 8 above. 491 shares no factor with 2-12; 491's divisors start beyond that range. 491 is odd, digit sum 14 for 491, digital root 5 for 491. 491 has 3 primes within 10 of 491.