Primes / Is 151 prime?

Is 151 a Prime Number?

Yes

151 is prime: for 151, testing every prime up to √151 ≈ 12.3 (namely 2, 3, 5, 7, 11) finds no divisor. 151 sits between primes 149 and 157, 2 below and 6 above. 151 shares no factor with 2-12; 151's divisors start beyond that range. 151 is odd, digit sum 7 for 151, digital root 7 for 151. 151 has 3 primes within 10 of 151.