Is 21031 a prime number?

21 031 is an odd number, because it is not evenly divisible by 2.

Find out more:

• What is an even 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 21 031 is about 145.021.

Thus, the square root of 21 031 is not an integer, and therefore 21 031 is not a square number.

Anyway, 21 031 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 21 031) is the result of the product of this number (21 031) by itself (i.e., 21 031 × 21 031); the square of 21 031 is sometimes called "raising 21 031 to the power 2", or "21 031 squared".

The square of 21 031 is 442 302 961 because 21 031 × 21 031 = 21 031² = 442 302 961.

As a consequence, 21 031 is the square root of 442 302 961.

21 031 is a number with 5 digits.

The multiples of 21 031 are all integers evenly divisible by 21 031, that is all numbers such that the remainder of the division by 21 031 is zero. There are infinitely many multiples of 21 031. The smallest multiples of 21 031 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 21 031 too, since 0 × 21 031 = 0
• 21 031: indeed, 21 031 is a multiple of itself, since 21 031 is evenly divisible by 21 031 (we have 21 031 / 21 031 = 1, so the remainder of this division is indeed zero)
• 42 062: indeed, 42 062 = 21 031 × 2
• 63 093: indeed, 63 093 = 21 031 × 3
• 84 124: indeed, 84 124 = 21 031 × 4
• 105 155: indeed, 105 155 = 21 031 × 5
• etc.

• Preceding numbers: …21 029, 21 030
• Following numbers: 21 032, 21 033…

Nearest numbers from 21 031

• Preceding prime number: 21 023
• Following prime number: 21 059

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• 21 031 est-il un nombre premier ?