Is 123721 a prime number?

123 721 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 123 721 is about 351.740.

Thus, the square root of 123 721 is not an integer, and therefore 123 721 is not a square number.

The square of a number (here 123 721) is the result of the product of this number (123 721) by itself (i.e., 123 721 × 123 721); the square of 123 721 is sometimes called "raising 123 721 to the power 2", or "123 721 squared".

The square of 123 721 is 15 306 885 841 because 123 721 × 123 721 = 123 721² = 15 306 885 841.

As a consequence, 123 721 is the square root of 15 306 885 841.

123 721 is a number with 6 digits.

The multiples of 123 721 are all integers evenly divisible by 123 721, that is all numbers such that the remainder of the division by 123 721 is zero. There are infinitely many multiples of 123 721. The smallest multiples of 123 721 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 123 721 too, since 0 × 123 721 = 0
• 123 721: indeed, 123 721 is a multiple of itself, since 123 721 is evenly divisible by 123 721 (we have 123 721 / 123 721 = 1, so the remainder of this division is indeed zero)
• 247 442: indeed, 247 442 = 123 721 × 2
• 371 163: indeed, 371 163 = 123 721 × 3
• 494 884: indeed, 494 884 = 123 721 × 4
• 618 605: indeed, 618 605 = 123 721 × 5
• etc.

• Preceding numbers: …123 719, 123 720
• Following numbers: 123 722, 123 723…

Nearest numbers from 123 721

• Preceding prime number: 123 719
• Following prime number: 123 727

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• 123 721 est-il un nombre premier ?