Is 720 a prime number? What are the divisors of 720?

## Parity of 720

720 is an even number, because it is evenly divisible by 2: 720 / 2 = 360.

Find out more:

## Is 720 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 720 is about 26.833.

Thus, the square root of 720 is not an integer, and therefore 720 is not a square number.

## What is the square number of 720?

The square of a number (here 720) is the result of the product of this number (720) by itself (i.e., 720 × 720); the square of 720 is sometimes called "raising 720 to the power 2", or "720 squared".

The square of 720 is 518 400 because 720 × 720 = 7202 = 518 400.

As a consequence, 720 is the square root of 518 400.

## Number of digits of 720

720 is a number with 3 digits.

## What are the multiples of 720?

The multiples of 720 are all integers evenly divisible by 720, that is all numbers such that the remainder of the division by 720 is zero. There are infinitely many multiples of 720. The smallest multiples of 720 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 720). 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 26.833). 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 720

• Preceding numbers: …718, 719
• Following numbers: 721, 722

### Nearest numbers from 720

• Preceding prime number: 719
• Following prime number: 727
Find out whether some integer is a prime number