Primes / Is 173 prime?

Is 173 a Prime Number?

Yes

173 is prime: for 173, testing every prime up to √173 ≈ 13.2 (namely 2, 3, 5, 7, 11, 13) finds no divisor. 173 sits between primes 167 and 179, 6 below and 6 above. 173 shares no factor with 2-12; 173's divisors start beyond that range. 173 is odd, digit sum 11 for 173, digital root 2 for 173. 173 has 5 primes within 10 of 173.