Primes / Is 28 prime?

Is 28 a Prime Number?

No28 = 2^2 x 7

28 is NOT prime: 2 × 14 = 28. That makes 2 a genuine divisor of 28 beyond 1 and 28 itself. Fully broken down, 28 = 2^2 × 7, for 6 divisors total. 28 sits between primes 23 and 29, 5 below and 1 above. 28: 2, 4, 7 divide 28 evenly, checked against 2-12. 28 is even, digit sum 10 for 28, digital root 1 for 28. 28 has 5 primes within 10 of 28.