Is 21139 a prime number?

21 139 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 21 139 is about 145.393.

Thus, the square root of 21 139 is not an integer, and therefore 21 139 is not a square number.

Anyway, 21 139 is a prime number, and a prime number cannot be a perfect square.

The square of a number (here 21 139) is the result of the product of this number (21 139) by itself (i.e., 21 139 × 21 139); the square of 21 139 is sometimes called "raising 21 139 to the power 2", or "21 139 squared".

The square of 21 139 is 446 857 321 because 21 139 × 21 139 = 21 139² = 446 857 321.

As a consequence, 21 139 is the square root of 446 857 321.

21 139 is a number with 5 digits.

The multiples of 21 139 are all integers evenly divisible by 21 139, that is all numbers such that the remainder of the division by 21 139 is zero. There are infinitely many multiples of 21 139. The smallest multiples of 21 139 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 21 139 too, since 0 × 21 139 = 0
• 21 139: indeed, 21 139 is a multiple of itself, since 21 139 is evenly divisible by 21 139 (we have 21 139 / 21 139 = 1, so the remainder of this division is indeed zero)
• 42 278: indeed, 42 278 = 21 139 × 2
• 63 417: indeed, 63 417 = 21 139 × 3
• 84 556: indeed, 84 556 = 21 139 × 4
• 105 695: indeed, 105 695 = 21 139 × 5
• etc.

• Preceding numbers: …21 137, 21 138
• Following numbers: 21 140, 21 141…

Nearest numbers from 21 139

• Preceding prime number: 21 121
• Following prime number: 21 143

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• 21 139 est-il un nombre premier ?