Is 222 a prime number? What are the divisors of 222?

## Parity of 222

222 is an even number, because it is evenly divisible by 2: 222 / 2 = 111.

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## Is 222 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 222 is about 14.900.

Thus, the square root of 222 is not an integer, and therefore 222 is not a square number.

## What is the square number of 222?

The square of a number (here 222) is the result of the product of this number (222) by itself (i.e., 222 × 222); the square of 222 is sometimes called "raising 222 to the power 2", or "222 squared".

The square of 222 is 49 284 because 222 × 222 = 2222 = 49 284.

As a consequence, 222 is the square root of 49 284.

## Number of digits of 222

222 is a number with 3 digits.

## What are the multiples of 222?

The multiples of 222 are all integers evenly divisible by 222, that is all numbers such that the remainder of the division by 222 is zero. There are infinitely many multiples of 222. The smallest multiples of 222 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 222 too, since 0 × 222 = 0
• 222: indeed, 222 is a multiple of itself, since 222 is evenly divisible by 222 (we have 222 / 222 = 1, so the remainder of this division is indeed zero)
• 444: indeed, 444 = 222 × 2
• 666: indeed, 666 = 222 × 3
• 888: indeed, 888 = 222 × 4
• 1 110: indeed, 1 110 = 222 × 5
• etc.

## 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 222). 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 14.900). 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 222

• Preceding numbers: …220, 221
• Following numbers: 223, 224

### Nearest numbers from 222

• Preceding prime number: 211
• Following prime number: 223
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