Is 19989 a prime number?

19 989 is an odd number, because it is not evenly divisible by 2.

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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 19 989 is about 141.382.

Thus, the square root of 19 989 is not an integer, and therefore 19 989 is not a square number.

The square of a number (here 19 989) is the result of the product of this number (19 989) by itself (i.e., 19 989 × 19 989); the square of 19 989 is sometimes called "raising 19 989 to the power 2", or "19 989 squared".

The square of 19 989 is 399 560 121 because 19 989 × 19 989 = 19 989² = 399 560 121.

As a consequence, 19 989 is the square root of 399 560 121.

19 989 is a number with 5 digits.

The multiples of 19 989 are all integers evenly divisible by 19 989, that is all numbers such that the remainder of the division by 19 989 is zero. There are infinitely many multiples of 19 989. The smallest multiples of 19 989 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 19 989 too, since 0 × 19 989 = 0
• 19 989: indeed, 19 989 is a multiple of itself, since 19 989 is evenly divisible by 19 989 (we have 19 989 / 19 989 = 1, so the remainder of this division is indeed zero)
• 39 978: indeed, 39 978 = 19 989 × 2
• 59 967: indeed, 59 967 = 19 989 × 3
• 79 956: indeed, 79 956 = 19 989 × 4
• 99 945: indeed, 99 945 = 19 989 × 5
• etc.

• Preceding numbers: …19 987, 19 988
• Following numbers: 19 990, 19 991…

Nearest numbers from 19 989

• Preceding prime number: 19 979
• Following prime number: 19 991

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• 19 989 est-il un nombre premier ?