Primes / Is 81 prime?

Is 81 a Prime Number?

No81 = 3^4

81 is NOT prime: 3 × 27 = 81. That makes 3 a genuine divisor of 81 beyond 1 and 81 itself. Fully broken down, 81 = 3^4, for 5 divisors total. 81 sits between primes 79 and 83, 2 below and 2 above. 81: 3, 9 divide 81 evenly, checked against 2-12. 81 is odd, digit sum 9 for 81, digital root 9 for 81. 81 has 5 primes within 10 of 81.