Is 406 a prime number? What are the divisors of 406?

## Parity of 406

406 is an even number, because it is evenly divisible by 2: 406 / 2 = 203.

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## Is 406 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 406 is about 20.149.

Thus, the square root of 406 is not an integer, and therefore 406 is not a square number.

## What is the square number of 406?

The square of a number (here 406) is the result of the product of this number (406) by itself (i.e., 406 × 406); the square of 406 is sometimes called "raising 406 to the power 2", or "406 squared".

The square of 406 is 164 836 because 406 × 406 = 4062 = 164 836.

As a consequence, 406 is the square root of 164 836.

## Number of digits of 406

406 is a number with 3 digits.

## What are the multiples of 406?

The multiples of 406 are all integers evenly divisible by 406, that is all numbers such that the remainder of the division by 406 is zero. There are infinitely many multiples of 406. The smallest multiples of 406 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 406). 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 20.149). 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 406

• Preceding numbers: …404, 405
• Following numbers: 407, 408

### Nearest numbers from 406

• Preceding prime number: 401
• Following prime number: 409
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