Is 21004 a prime number?

21 004 is an even number, because it is evenly divisible by 2: 21 004 / 2 = 10 502.

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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 21 004 is about 144.928.

Thus, the square root of 21 004 is not an integer, and therefore 21 004 is not a square number.

The square of a number (here 21 004) is the result of the product of this number (21 004) by itself (i.e., 21 004 × 21 004); the square of 21 004 is sometimes called "raising 21 004 to the power 2", or "21 004 squared".

The square of 21 004 is 441 168 016 because 21 004 × 21 004 = 21 004² = 441 168 016.

As a consequence, 21 004 is the square root of 441 168 016.

21 004 is a number with 5 digits.

The multiples of 21 004 are all integers evenly divisible by 21 004, that is all numbers such that the remainder of the division by 21 004 is zero. There are infinitely many multiples of 21 004. The smallest multiples of 21 004 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 21 004 too, since 0 × 21 004 = 0
• 21 004: indeed, 21 004 is a multiple of itself, since 21 004 is evenly divisible by 21 004 (we have 21 004 / 21 004 = 1, so the remainder of this division is indeed zero)
• 42 008: indeed, 42 008 = 21 004 × 2
• 63 012: indeed, 63 012 = 21 004 × 3
• 84 016: indeed, 84 016 = 21 004 × 4
• 105 020: indeed, 105 020 = 21 004 × 5
• etc.

• Preceding numbers: …21 002, 21 003
• Following numbers: 21 005, 21 006…

Nearest numbers from 21 004

• Preceding prime number: 21 001
• Following prime number: 21 011

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• 21 004 est-il un nombre premier ?