Is 540 a prime number?

It is possible to find out using mathematical methods whether a given integer is a prime number or not.

For 540, the answer is: No, 540 is not a prime number.

The list of all positive divisors (i.e., the list of all integers that divide 540) is as follows: 1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 90, 108, 135, 180, 270, 540.

For 540 to be a prime number, it would have been required that 540 has only two divisors, i.e., itself and 1.

Find out more:

What is a prime number?

Actually, one can immediately see that 540 cannot be prime, because 5 is one of its divisors: indeed, a number ending with 0 or 5 has necessarily 5 among its divisors. The last digit of 540 is 0, so it is divisible by 5 and is therefore not prime.

As a consequence:

540 is a multiple of 1
540 is a multiple of 2
540 is a multiple of 3
540 is a multiple of 4
540 is a multiple of 5
540 is a multiple of 6
540 is a multiple of 9
540 is a multiple of 10
540 is a multiple of 12
540 is a multiple of 15
540 is a multiple of 18
540 is a multiple of 20
540 is a multiple of 27
540 is a multiple of 30
540 is a multiple of 36
540 is a multiple of 45
540 is a multiple of 54
540 is a multiple of 60
540 is a multiple of 90
540 is a multiple of 108
540 is a multiple of 135
540 is a multiple of 180
540 is a multiple of 270

For 540 to be a prime number, it would have been required that 540 has only two divisors, i.e., itself and 1.

Is 540 a deficient number?

No, 540 is not a deficient number: to be deficient, 540 should have been such that 540 is larger than the sum of its proper divisors, i.e., the divisors of 540 without 540 itself (that is 1 + 2 + 3 + 4 + 5 + 6 + 9 + 10 + 12 + 15 + 18 + 20 + 27 + 30 + 36 + 45 + 54 + 60 + 90 + 108 + 135 + 180 + 270 = 1 140).

In fact, 540 is an abundant number; 540 is strictly smaller than the sum of its proper divisors (that is 1 + 2 + 3 + 4 + 5 + 6 + 9 + 10 + 12 + 15 + 18 + 20 + 27 + 30 + 36 + 45 + 54 + 60 + 90 + 108 + 135 + 180 + 270 = 1 140). The smallest abundant number is 12.

Parity of 540

540 is an even number, because it is evenly divisible by 2: 540 / 2 = 270.

Find out more:

What is an even number?

Is 540 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 540 is about 23.238.

Thus, the square root of 540 is not an integer, and therefore 540 is not a square number.

What is the square number of 540?

The square of a number (here 540) is the result of the product of this number (540) by itself (i.e., 540 × 540); the square of 540 is sometimes called "raising 540 to the power 2", or "540 squared".

The square of 540 is 291 600 because 540 × 540 = 540² = 291 600.

As a consequence, 540 is the square root of 291 600.

Number of digits of 540

540 is a number with 3 digits.

What are the multiples of 540?

The multiples of 540 are all integers evenly divisible by 540, that is all numbers such that the remainder of the division by 540 is zero. There are infinitely many multiples of 540. The smallest multiples of 540 are:

0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 540 too, since 0 × 540 = 0
540: indeed, 540 is a multiple of itself, since 540 is evenly divisible by 540 (we have 540 / 540 = 1, so the remainder of this division is indeed zero)
1 080: indeed, 1 080 = 540 × 2
1 620: indeed, 1 620 = 540 × 3
2 160: indeed, 2 160 = 540 × 4
2 700: indeed, 2 700 = 540 × 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 540). 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 23.238). 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 540

Preceding numbers: …538, 539
Following numbers: 541, 542…

Nearest numbers from 540

Preceding prime number: 523
Following prime number: 541