Primes / Is 433 prime?

Is 433 a Prime Number?

Yes

433 is prime: for 433, testing every prime up to √433 ≈ 20.8 (namely 2, 3, 5, 7, 11, 13, 17, 19) finds no divisor. 433 sits between primes 431 and 439, 2 below and 6 above. 433 shares no factor with 2-12; 433's divisors start beyond that range. 433 is odd, digit sum 10 for 433, digital root 1 for 433. 433 has 4 primes within 10 of 433.