Is 400000000 a prime number?

400 000 000 is an even number, because it is evenly divisible by 2: 400 000 000 / 2 = 200 000 000.

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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 400 000 000 is 20 000.

Therefore, the square root of 400 000 000 is an integer, and as a consequence 400 000 000 is a perfect square.

As a consequence, 20 000 is the square root of 400 000 000.

The square of a number (here 400 000 000) is the result of the product of this number (400 000 000) by itself (i.e., 400 000 000 × 400 000 000); the square of 400 000 000 is sometimes called "raising 400 000 000 to the power 2", or "400 000 000 squared".

The square of 400 000 000 is 160 000 000 000 000 000 because 400 000 000 × 400 000 000 = 400 000 000² = 160 000 000 000 000 000.

As a consequence, 400 000 000 is the square root of 160 000 000 000 000 000.

400 000 000 is a number with 9 digits.

The multiples of 400 000 000 are all integers evenly divisible by 400 000 000, that is all numbers such that the remainder of the division by 400 000 000 is zero. There are infinitely many multiples of 400 000 000. The smallest multiples of 400 000 000 are:

• 0: indeed, 0 is divisible by any natural number, and it is thus a multiple of 400 000 000 too, since 0 × 400 000 000 = 0
• 400 000 000: indeed, 400 000 000 is a multiple of itself, since 400 000 000 is evenly divisible by 400 000 000 (we have 400 000 000 / 400 000 000 = 1, so the remainder of this division is indeed zero)
• 800 000 000: indeed, 800 000 000 = 400 000 000 × 2
• 1 200 000 000: indeed, 1 200 000 000 = 400 000 000 × 3
• 1 600 000 000: indeed, 1 600 000 000 = 400 000 000 × 4
• 2 000 000 000: indeed, 2 000 000 000 = 400 000 000 × 5
• etc.

• Preceding numbers: …399 999 998, 399 999 999
• Following numbers: 400 000 001, 400 000 002…

Nearest numbers from 400 000 000

• Preceding prime number: 399 999 959
• Following prime number: 400 000 009

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• 400 000 000 est-il un nombre premier ?