Primes / Is 79 prime?

Is 79 a Prime Number?

Yes

79 is prime: for 79, testing every prime up to √79 ≈ 8.9 (namely 2, 3, 5, 7) finds no divisor. 79 sits between primes 73 and 83, 6 below and 4 above. 79 shares no factor with 2-12; 79's divisors start beyond that range. 79 is odd, digit sum 16 for 79, digital root 7 for 79. 79 has 5 primes within 10 of 79.