Is 660 a prime number? What are the divisors of 660?

## Parity of 660

660 is an even number, because it is evenly divisible by 2: 660 / 2 = 330.

Find out more:

## Is 660 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 660 is about 25.690.

Thus, the square root of 660 is not an integer, and therefore 660 is not a square number.

## What is the square number of 660?

The square of a number (here 660) is the result of the product of this number (660) by itself (i.e., 660 × 660); the square of 660 is sometimes called "raising 660 to the power 2", or "660 squared".

The square of 660 is 435 600 because 660 × 660 = 6602 = 435 600.

As a consequence, 660 is the square root of 435 600.

## Number of digits of 660

660 is a number with 3 digits.

## What are the multiples of 660?

The multiples of 660 are all integers evenly divisible by 660, that is all numbers such that the remainder of the division by 660 is zero. There are infinitely many multiples of 660. The smallest multiples of 660 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 660). 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 25.690). 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 660

• Preceding numbers: …658, 659
• Following numbers: 661, 662

### Nearest numbers from 660

• Preceding prime number: 659
• Following prime number: 661
Find out whether some integer is a prime number