Primes / Is 7 prime?

Is 7 a Prime Number?

Yes

7 is prime: for 7, testing every prime up to √7 ≈ 2.6 (namely 2) finds no divisor. 7 sits between primes 5 and 11, 2 below and 4 above. 7 shares no factor with 2-12; 7's divisors start beyond that range. 7 is odd, digit sum 7 for 7, digital root 7 for 7. 7 has 7 primes within 10 of 7.