Is 20990 a prime number?

20 990 is an even number, because it is evenly divisible by 2: 20 990 / 2 = 10 495.

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• 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 20 990 is about 144.879.

Thus, the square root of 20 990 is not an integer, and therefore 20 990 is not a square number.

The square of a number (here 20 990) is the result of the product of this number (20 990) by itself (i.e., 20 990 × 20 990); the square of 20 990 is sometimes called "raising 20 990 to the power 2", or "20 990 squared".

The square of 20 990 is 440 580 100 because 20 990 × 20 990 = 20 990² = 440 580 100.

As a consequence, 20 990 is the square root of 440 580 100.

20 990 is a number with 5 digits.

The multiples of 20 990 are all integers evenly divisible by 20 990, that is all numbers such that the remainder of the division by 20 990 is zero. There are infinitely many multiples of 20 990. The smallest multiples of 20 990 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 20 990 too, since 0 × 20 990 = 0
• 20 990: indeed, 20 990 is a multiple of itself, since 20 990 is evenly divisible by 20 990 (we have 20 990 / 20 990 = 1, so the remainder of this division is indeed zero)
• 41 980: indeed, 41 980 = 20 990 × 2
• 62 970: indeed, 62 970 = 20 990 × 3
• 83 960: indeed, 83 960 = 20 990 × 4
• 104 950: indeed, 104 950 = 20 990 × 5
• etc.

• Preceding numbers: …20 988, 20 989
• Following numbers: 20 991, 20 992…

Nearest numbers from 20 990

• Preceding prime number: 20 983
• Following prime number: 21 001

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• 20 990 est-il un nombre premier ?