Is 42391 a prime number?

42 391 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 42 391 is about 205.891.

Thus, the square root of 42 391 is not an integer, and therefore 42 391 is not a square number.

Anyway, 42 391 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 42 391) is the result of the product of this number (42 391) by itself (i.e., 42 391 × 42 391); the square of 42 391 is sometimes called "raising 42 391 to the power 2", or "42 391 squared".

The square of 42 391 is 1 796 996 881 because 42 391 × 42 391 = 42 391² = 1 796 996 881.

As a consequence, 42 391 is the square root of 1 796 996 881.

42 391 is a number with 5 digits.

The multiples of 42 391 are all integers evenly divisible by 42 391, that is all numbers such that the remainder of the division by 42 391 is zero. There are infinitely many multiples of 42 391. The smallest multiples of 42 391 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 42 391 too, since 0 × 42 391 = 0
• 42 391: indeed, 42 391 is a multiple of itself, since 42 391 is evenly divisible by 42 391 (we have 42 391 / 42 391 = 1, so the remainder of this division is indeed zero)
• 84 782: indeed, 84 782 = 42 391 × 2
• 127 173: indeed, 127 173 = 42 391 × 3
• 169 564: indeed, 169 564 = 42 391 × 4
• 211 955: indeed, 211 955 = 42 391 × 5
• etc.

• Preceding numbers: …42 389, 42 390
• Following numbers: 42 392, 42 393…

Nearest numbers from 42 391

• Preceding prime number: 42 379
• Following prime number: 42 397

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• 42 391 est-il un nombre premier ?