3 x 3 x 3 x 3 = 81
The only prime numbers between 81 and 90 is... 83
83
If you mean: 53 81 41 47 and 31 then 81 is a composite number while all the rest are prime numbers
They are: 79+2 = 81
3,
No because they are all composite numbers having more than two factors
Just 3.
Yes.
It must be 81 because 9 squared is 81 and 9 is not a prime number whereas the other numbers are squared prime numbers.
The prime numbers between 80 and 90 are 83 and 89.
All the prime numbers from 1 to 81 are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, and 79.
67