Primes / Is 443 prime?

Is 443 a Prime Number?

Yes

443 is prime: for 443, testing every prime up to √443 ≈ 21.0 (namely 2, 3, 5, 7, 11, 13, 17, 19) finds no divisor. 443 sits between primes 439 and 449, 4 below and 6 above. 443 shares no factor with 2-12; 443's divisors start beyond that range. 443 is odd, digit sum 11 for 443, digital root 2 for 443. 443 has 4 primes within 10 of 443.