Primes / Is 137 prime?

Is 137 a Prime Number?

Yes

137 is prime: for 137, testing every prime up to √137 ≈ 11.7 (namely 2, 3, 5, 7, 11) finds no divisor. 137 sits between primes 131 and 139, 6 below and 2 above. 137 shares no factor with 2-12; 137's divisors start beyond that range. 137 is odd, digit sum 11 for 137, digital root 2 for 137. 137 has 4 primes within 10 of 137.