Is 989 a prime number? What are the divisors of 989?

## Parity of 989

989 is an odd number, because it is not evenly divisible by 2.

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## Is 989 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 989 is about 31.448.

Thus, the square root of 989 is not an integer, and therefore 989 is not a square number.

## What is the square number of 989?

The square of a number (here 989) is the result of the product of this number (989) by itself (i.e., 989 × 989); the square of 989 is sometimes called "raising 989 to the power 2", or "989 squared".

The square of 989 is 978 121 because 989 × 989 = 9892 = 978 121.

As a consequence, 989 is the square root of 978 121.

## Number of digits of 989

989 is a number with 3 digits.

## What are the multiples of 989?

The multiples of 989 are all integers evenly divisible by 989, that is all numbers such that the remainder of the division by 989 is zero. There are infinitely many multiples of 989. The smallest multiples of 989 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 989). 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 31.448). 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 989

• Preceding numbers: …987, 988
• Following numbers: 990, 991

### Nearest numbers from 989

• Preceding prime number: 983
• Following prime number: 991
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