Is 1989 a prime number?

1 989 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 1 989 is about 44.598.

Thus, the square root of 1 989 is not an integer, and therefore 1 989 is not a square number.

The square of a number (here 1 989) is the result of the product of this number (1 989) by itself (i.e., 1 989 × 1 989); the square of 1 989 is sometimes called "raising 1 989 to the power 2", or "1 989 squared".

The square of 1 989 is 3 956 121 because 1 989 × 1 989 = 1 989² = 3 956 121.

As a consequence, 1 989 is the square root of 3 956 121.

1 989 is a number with 4 digits.

The multiples of 1 989 are all integers evenly divisible by 1 989, that is all numbers such that the remainder of the division by 1 989 is zero. There are infinitely many multiples of 1 989. The smallest multiples of 1 989 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 989 too, since 0 × 1 989 = 0
• 1 989: indeed, 1 989 is a multiple of itself, since 1 989 is evenly divisible by 1 989 (we have 1 989 / 1 989 = 1, so the remainder of this division is indeed zero)
• 3 978: indeed, 3 978 = 1 989 × 2
• 5 967: indeed, 5 967 = 1 989 × 3
• 7 956: indeed, 7 956 = 1 989 × 4
• 9 945: indeed, 9 945 = 1 989 × 5
• etc.

• Preceding numbers: …1 987, 1 988
• Following numbers: 1 990, 1 991…

Nearest numbers from 1 989

• Preceding prime number: 1 987
• Following prime number: 1 993

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• 1 989 est-il un nombre premier ?