Is 530 a prime number?

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

For 530, the answer is: No, 530 is not a prime number.

The list of all positive divisors (i.e., the list of all integers that divide 530) is as follows: 1, 2, 5, 10, 53, 106, 265, 530.

For 530 to be a prime number, it would have been required that 530 has only two divisors, i.e., itself and 1.

Find out more:

What is a prime number?

Actually, one can immediately see that 530 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 530 is 0, so it is divisible by 5 and is therefore not prime.

As a consequence:

530 is a multiple of 1
530 is a multiple of 2
530 is a multiple of 5
530 is a multiple of 10
530 is a multiple of 53
530 is a multiple of 106
530 is a multiple of 265

For 530 to be a prime number, it would have been required that 530 has only two divisors, i.e., itself and 1.

Is 530 a deficient number?

Yes, 530 is a deficient number, that is to say 530 is a natural number that is strictly larger than the sum of its proper divisors, i.e., the divisors of 530 without 530 itself (that is 1 + 2 + 5 + 10 + 53 + 106 + 265 = 442).

Parity of 530

530 is an even number, because it is evenly divisible by 2: 530 / 2 = 265.

Find out more:

What is an even number?

Is 530 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 530 is about 23.022.

Thus, the square root of 530 is not an integer, and therefore 530 is not a square number.

What is the square number of 530?

The square of a number (here 530) is the result of the product of this number (530) by itself (i.e., 530 × 530); the square of 530 is sometimes called "raising 530 to the power 2", or "530 squared".

The square of 530 is 280 900 because 530 × 530 = 530² = 280 900.

As a consequence, 530 is the square root of 280 900.

Number of digits of 530

530 is a number with 3 digits.

What are the multiples of 530?

The multiples of 530 are all integers evenly divisible by 530, that is all numbers such that the remainder of the division by 530 is zero. There are infinitely many multiples of 530. The smallest multiples of 530 are:

0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 530 too, since 0 × 530 = 0
530: indeed, 530 is a multiple of itself, since 530 is evenly divisible by 530 (we have 530 / 530 = 1, so the remainder of this division is indeed zero)
1 060: indeed, 1 060 = 530 × 2
1 590: indeed, 1 590 = 530 × 3
2 120: indeed, 2 120 = 530 × 4
2 650: indeed, 2 650 = 530 × 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 530). 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 23.022). 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 530

Preceding numbers: …528, 529
Following numbers: 531, 532…

Nearest numbers from 530

Preceding prime number: 523
Following prime number: 541