Is 990 a prime number? What are the divisors of 990?

## Parity of 990

990 is an even number, because it is evenly divisible by 2: 990 / 2 = 495.

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## Is 990 a perfect square number?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 990 is about 31.464.

Thus, the square root of 990 is not an integer, and therefore 990 is not a square number.

## What is the square number of 990?

The square of a number (here 990) is the result of the product of this number (990) by itself (i.e., 990 × 990); the square of 990 is sometimes called "raising 990 to the power 2", or "990 squared".

The square of 990 is 980 100 because 990 × 990 = 9902 = 980 100.

As a consequence, 990 is the square root of 980 100.

## Number of digits of 990

990 is a number with 3 digits.

## What are the multiples of 990?

The multiples of 990 are all integers evenly divisible by 990, that is all numbers such that the remainder of the division by 990 is zero. There are infinitely many multiples of 990. The smallest multiples of 990 are:

## How to determine whether an integer is a prime number?

To determine the primality of a number, several algorithms can be used. The most naive technique is to test all divisors strictly smaller to the number of which we want to determine the primality (here 990). First, we can eliminate all even numbers greater than 2 (and hence 4, 6, 8…). Then, we can stop this check when we reach the square root of the number of which we want to determine the primality (here the square root is about 31.464). Historically, the sieve of Eratosthenes (dating from the Greek mathematics) implements this technique in a relatively efficient manner.

More modern techniques include the sieve of Atkin, probabilistic algorithms, and the cyclotomic AKS test.

## Numbers near 990

• Preceding numbers: …988, 989
• Following numbers: 991, 992

### Nearest numbers from 990

• Preceding prime number: 983
• Following prime number: 991
Find out whether some integer is a prime number