Is 445 a prime number? What are the divisors of 445?

## Parity of 445

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

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## Is 445 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 445 is about 21.095.

Thus, the square root of 445 is not an integer, and therefore 445 is not a square number.

## What is the square number of 445?

The square of a number (here 445) is the result of the product of this number (445) by itself (i.e., 445 × 445); the square of 445 is sometimes called "raising 445 to the power 2", or "445 squared".

The square of 445 is 198 025 because 445 × 445 = 4452 = 198 025.

As a consequence, 445 is the square root of 198 025.

## Number of digits of 445

445 is a number with 3 digits.

## What are the multiples of 445?

The multiples of 445 are all integers evenly divisible by 445, that is all numbers such that the remainder of the division by 445 is zero. There are infinitely many multiples of 445. The smallest multiples of 445 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 445). 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 21.095). 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 445

• Preceding numbers: …443, 444
• Following numbers: 446, 447

### Nearest numbers from 445

• Preceding prime number: 443
• Following prime number: 449
Find out whether some integer is a prime number