Is 636 a prime number? What are the divisors of 636?

## Parity of 636

636 is an even number, because it is evenly divisible by 2: 636 / 2 = 318.

Find out more:

## Is 636 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 636 is about 25.219.

Thus, the square root of 636 is not an integer, and therefore 636 is not a square number.

## What is the square number of 636?

The square of a number (here 636) is the result of the product of this number (636) by itself (i.e., 636 × 636); the square of 636 is sometimes called "raising 636 to the power 2", or "636 squared".

The square of 636 is 404 496 because 636 × 636 = 6362 = 404 496.

As a consequence, 636 is the square root of 404 496.

## Number of digits of 636

636 is a number with 3 digits.

## What are the multiples of 636?

The multiples of 636 are all integers evenly divisible by 636, that is all numbers such that the remainder of the division by 636 is zero. There are infinitely many multiples of 636. The smallest multiples of 636 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 636). 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 25.219). 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 636

• Preceding numbers: …634, 635
• Following numbers: 637, 638

### Nearest numbers from 636

• Preceding prime number: 631
• Following prime number: 641
Find out whether some integer is a prime number