It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 000 016 is not a prime number.
For example, 400 000 016 can be divided by 2: 400 000 016 / 2 = 200 000 008.
For 400 000 016 to be a prime number, it would have been required that 400 000 016 has only two divisors, i.e., itself and 1.
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400 000 016 is an even number, because it is evenly divisible by 2: 400 000 016 / 2 = 200 000 008.
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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 400 000 016 is about 20 000.000.
Thus, the square root of 400 000 016 is not an integer, and therefore 400 000 016 is not a square number.
The square of a number (here 400 000 016) is the result of the product of this number (400 000 016) by itself (i.e., 400 000 016 × 400 000 016); the square of 400 000 016 is sometimes called "raising 400 000 016 to the power 2", or "400 000 016 squared".
The square of 400 000 016 is 160 000 012 800 000 256 because 400 000 016 × 400 000 016 = 400 000 0162 = 160 000 012 800 000 256.
As a consequence, 400 000 016 is the square root of 160 000 012 800 000 256.
400 000 016 is a number with 9 digits.
The multiples of 400 000 016 are all integers evenly divisible by 400 000 016, that is all numbers such that the remainder of the division by 400 000 016 is zero. There are infinitely many multiples of 400 000 016. The smallest multiples of 400 000 016 are: