Is 21920 a prime number?

21 920 is an even number, because it is evenly divisible by 2: 21 920 / 2 = 10 960.

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 21 920 is about 148.054.

Thus, the square root of 21 920 is not an integer, and therefore 21 920 is not a square number.

The square of a number (here 21 920) is the result of the product of this number (21 920) by itself (i.e., 21 920 × 21 920); the square of 21 920 is sometimes called "raising 21 920 to the power 2", or "21 920 squared".

The square of 21 920 is 480 486 400 because 21 920 × 21 920 = 21 920² = 480 486 400.

As a consequence, 21 920 is the square root of 480 486 400.

21 920 is a number with 5 digits.

The multiples of 21 920 are all integers evenly divisible by 21 920, that is all numbers such that the remainder of the division by 21 920 is zero. There are infinitely many multiples of 21 920. The smallest multiples of 21 920 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 21 920 too, since 0 × 21 920 = 0
• 21 920: indeed, 21 920 is a multiple of itself, since 21 920 is evenly divisible by 21 920 (we have 21 920 / 21 920 = 1, so the remainder of this division is indeed zero)
• 43 840: indeed, 43 840 = 21 920 × 2
• 65 760: indeed, 65 760 = 21 920 × 3
• 87 680: indeed, 87 680 = 21 920 × 4
• 109 600: indeed, 109 600 = 21 920 × 5
• etc.

• Preceding numbers: …21 918, 21 919
• Following numbers: 21 921, 21 922…

Nearest numbers from 21 920

• Preceding prime number: 21 911
• Following prime number: 21 929

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• 21 920 est-il un nombre premier ?