Primes / Is 157 prime?

Is 157 a Prime Number?

Yes

157 is prime: for 157, testing every prime up to √157 ≈ 12.5 (namely 2, 3, 5, 7, 11) finds no divisor. 157 sits between primes 151 and 163, 6 below and 6 above. 157 shares no factor with 2-12; 157's divisors start beyond that range. 157 is odd, digit sum 13 for 157, digital root 4 for 157. 157 has 5 primes within 10 of 157.