Is 68 a prime number? What are the divisors of 68?

## Parity of 68

68 is an even number, because it is evenly divisible by 2: 68 / 2 = 34.

Find out more:

## Is 68 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 68 is about 8.246.

Thus, the square root of 68 is not an integer, and therefore 68 is not a square number.

## What is the square number of 68?

The square of a number (here 68) is the result of the product of this number (68) by itself (i.e., 68 × 68); the square of 68 is sometimes called "raising 68 to the power 2", or "68 squared".

The square of 68 is 4 624 because 68 × 68 = 682 = 4 624.

As a consequence, 68 is the square root of 4 624.

## Number of digits of 68

68 is a number with 2 digits.

## What are the multiples of 68?

The multiples of 68 are all integers evenly divisible by 68, that is all numbers such that the remainder of the division by 68 is zero. There are infinitely many multiples of 68. The smallest multiples of 68 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 68 too, since 0 × 68 = 0
• 68: indeed, 68 is a multiple of itself, since 68 is evenly divisible by 68 (we have 68 / 68 = 1, so the remainder of this division is indeed zero)
• 136: indeed, 136 = 68 × 2
• 204: indeed, 204 = 68 × 3
• 272: indeed, 272 = 68 × 4
• 340: indeed, 340 = 68 × 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 68). 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 8.246). 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 68

• Preceding numbers: …66, 67
• Following numbers: 69, 70

### Nearest numbers from 68

• Preceding prime number: 67
• Following prime number: 71
Find out whether some integer is a prime number