Is 42991 a prime number?

42 991 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 42 991 is about 207.343.

Thus, the square root of 42 991 is not an integer, and therefore 42 991 is not a square number.

The square of a number (here 42 991) is the result of the product of this number (42 991) by itself (i.e., 42 991 × 42 991); the square of 42 991 is sometimes called "raising 42 991 to the power 2", or "42 991 squared".

The square of 42 991 is 1 848 226 081 because 42 991 × 42 991 = 42 991² = 1 848 226 081.

As a consequence, 42 991 is the square root of 1 848 226 081.

42 991 is a number with 5 digits.

The multiples of 42 991 are all integers evenly divisible by 42 991, that is all numbers such that the remainder of the division by 42 991 is zero. There are infinitely many multiples of 42 991. The smallest multiples of 42 991 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 42 991 too, since 0 × 42 991 = 0
• 42 991: indeed, 42 991 is a multiple of itself, since 42 991 is evenly divisible by 42 991 (we have 42 991 / 42 991 = 1, so the remainder of this division is indeed zero)
• 85 982: indeed, 85 982 = 42 991 × 2
• 128 973: indeed, 128 973 = 42 991 × 3
• 171 964: indeed, 171 964 = 42 991 × 4
• 214 955: indeed, 214 955 = 42 991 × 5
• etc.

• Preceding numbers: …42 989, 42 990
• Following numbers: 42 992, 42 993…

Nearest numbers from 42 991

• Preceding prime number: 42 989
• Following prime number: 43 003

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• 42 991 est-il un nombre premier ?