Primes / Is 277 prime?

Is 277 a Prime Number?

Yes

277 is prime: for 277, testing every prime up to √277 ≈ 16.6 (namely 2, 3, 5, 7, 11, 13) finds no divisor. 277 sits between primes 271 and 281, 6 below and 4 above. 277 shares no factor with 2-12; 277's divisors start beyond that range. 277 is odd, digit sum 16 for 277, digital root 7 for 277. 277 has 5 primes within 10 of 277.