Primes / Is 131 prime?

Is 131 a Prime Number?

Yes

131 is prime: for 131, testing every prime up to √131 ≈ 11.4 (namely 2, 3, 5, 7, 11) finds no divisor. 131 sits between primes 127 and 137, 4 below and 6 above. 131 shares no factor with 2-12; 131's divisors start beyond that range. 131 is odd, digit sum 5 for 131, digital root 5 for 131. 131 has 4 primes within 10 of 131.