Primes / Is 127 prime?

Is 127 a Prime Number?

Yes

127 is prime: for 127, testing every prime up to √127 ≈ 11.3 (namely 2, 3, 5, 7, 11) finds no divisor. 127 sits between primes 113 and 131, 14 below and 4 above. 127 shares no factor with 2-12; 127's divisors start beyond that range. 127 is odd, digit sum 10 for 127, digital root 1 for 127. 127 has 3 primes within 10 of 127.