Is 1981 a prime number?

1 981 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 1 981 is about 44.508.

Thus, the square root of 1 981 is not an integer, and therefore 1 981 is not a square number.

The square of a number (here 1 981) is the result of the product of this number (1 981) by itself (i.e., 1 981 × 1 981); the square of 1 981 is sometimes called "raising 1 981 to the power 2", or "1 981 squared".

The square of 1 981 is 3 924 361 because 1 981 × 1 981 = 1 981² = 3 924 361.

As a consequence, 1 981 is the square root of 3 924 361.

1 981 is a number with 4 digits.

The multiples of 1 981 are all integers evenly divisible by 1 981, that is all numbers such that the remainder of the division by 1 981 is zero. There are infinitely many multiples of 1 981. The smallest multiples of 1 981 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 1 981 too, since 0 × 1 981 = 0
• 1 981: indeed, 1 981 is a multiple of itself, since 1 981 is evenly divisible by 1 981 (we have 1 981 / 1 981 = 1, so the remainder of this division is indeed zero)
• 3 962: indeed, 3 962 = 1 981 × 2
• 5 943: indeed, 5 943 = 1 981 × 3
• 7 924: indeed, 7 924 = 1 981 × 4
• 9 905: indeed, 9 905 = 1 981 × 5
• etc.

• Preceding numbers: …1 979, 1 980
• Following numbers: 1 982, 1 983…

Nearest numbers from 1 981

• Preceding prime number: 1 979
• Following prime number: 1 987

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• 1 981 est-il un nombre premier ?