Primes / Is 89 prime?

Is 89 a Prime Number?

Yes

89 is prime: for 89, testing every prime up to √89 ≈ 9.4 (namely 2, 3, 5, 7) finds no divisor. 89 sits between primes 83 and 97, 6 below and 8 above. 89 shares no factor with 2-12; 89's divisors start beyond that range. 89 is odd, digit sum 17 for 89, digital root 8 for 89. 89 has 4 primes within 10 of 89.