Is 280 a prime number? What are the divisors of 280?

## Parity of 280

280 is an even number, because it is evenly divisible by 2: 280 / 2 = 140.

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## Is 280 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 280 is about 16.733.

Thus, the square root of 280 is not an integer, and therefore 280 is not a square number.

## What is the square number of 280?

The square of a number (here 280) is the result of the product of this number (280) by itself (i.e., 280 × 280); the square of 280 is sometimes called "raising 280 to the power 2", or "280 squared".

The square of 280 is 78 400 because 280 × 280 = 2802 = 78 400.

As a consequence, 280 is the square root of 78 400.

## Number of digits of 280

280 is a number with 3 digits.

## What are the multiples of 280?

The multiples of 280 are all integers evenly divisible by 280, that is all numbers such that the remainder of the division by 280 is zero. There are infinitely many multiples of 280. The smallest multiples of 280 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 280). 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 16.733). 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 280

• Preceding numbers: …278, 279
• Following numbers: 281, 282

### Nearest numbers from 280

• Preceding prime number: 277
• Following prime number: 281
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