Is 21840 a prime number?

21 840 is an even number, because it is evenly divisible by 2: 21 840 / 2 = 10 920.

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 21 840 is about 147.784.

Thus, the square root of 21 840 is not an integer, and therefore 21 840 is not a square number.

The square of a number (here 21 840) is the result of the product of this number (21 840) by itself (i.e., 21 840 × 21 840); the square of 21 840 is sometimes called "raising 21 840 to the power 2", or "21 840 squared".

The square of 21 840 is 476 985 600 because 21 840 × 21 840 = 21 840² = 476 985 600.

As a consequence, 21 840 is the square root of 476 985 600.

21 840 is a number with 5 digits.

The multiples of 21 840 are all integers evenly divisible by 21 840, that is all numbers such that the remainder of the division by 21 840 is zero. There are infinitely many multiples of 21 840. The smallest multiples of 21 840 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 21 840 too, since 0 × 21 840 = 0
• 21 840: indeed, 21 840 is a multiple of itself, since 21 840 is evenly divisible by 21 840 (we have 21 840 / 21 840 = 1, so the remainder of this division is indeed zero)
• 43 680: indeed, 43 680 = 21 840 × 2
• 65 520: indeed, 65 520 = 21 840 × 3
• 87 360: indeed, 87 360 = 21 840 × 4
• 109 200: indeed, 109 200 = 21 840 × 5
• etc.

• Preceding numbers: …21 838, 21 839
• Following numbers: 21 841, 21 842…

Nearest numbers from 21 840

• Preceding prime number: 21 839
• Following prime number: 21 841

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• 21 840 est-il un nombre premier ?