# Is 99 a Prime Number?

No, **99** is not a *prime number*, it is a composite number.

### 99 Not a Prime Number Proof with Adraktas Formula

X = 99

a_{5} = [ X - 5 ] / 6

a_{5} = [ 99 - 5 ] / 6

a_{5} = **15.6666666667**

a_{5} is not integer

a_{7} = [ X - 7 ] / 6

a_{7} = [ 99 - 7 ] / 6

a_{7} = 15.3333333333

a_{7} is not integer

Both a_{5} and a_{7} is not integer.

### 99 is not a prime number

### Why 99 is not a prime number?

Because **99** has divisors rather than 1 and itself.
99 can be divided by 3 and 3.

Prime factorization of *99* (list of divisors):

*The next prime number* of 99 is **101**

*The previous prime* number of 99 is **97**.

### Related Prime Numbers

Biggest 10 prime numbers smaller than **99**

Smallest 10 prime numbers bigger than **99**

### Related Non-Prime Numbers

Biggest 10 composite numbers smaller than **99**

Smallest 10 composite numbers bigger than **99**