It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 493 398 is not a prime number.
For example, 400 493 398 can be divided by 2: 400 493 398 / 2 = 200 246 699.
For 400 493 398 to be a prime number, it would have been required that 400 493 398 has only two divisors, i.e., itself and 1.
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400 493 398 is an even number, because it is evenly divisible by 2: 400 493 398 / 2 = 200 246 699.
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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 400 493 398 is about 20 012.331.
Thus, the square root of 400 493 398 is not an integer, and therefore 400 493 398 is not a square number.
The square of a number (here 400 493 398) is the result of the product of this number (400 493 398) by itself (i.e., 400 493 398 × 400 493 398); the square of 400 493 398 is sometimes called "raising 400 493 398 to the power 2", or "400 493 398 squared".
The square of 400 493 398 is 160 394 961 841 586 400 because 400 493 398 × 400 493 398 = 400 493 3982 = 160 394 961 841 586 400.
As a consequence, 400 493 398 is the square root of 160 394 961 841 586 400.
400 493 398 is a number with 9 digits.
The multiples of 400 493 398 are all integers evenly divisible by 400 493 398, that is all numbers such that the remainder of the division by 400 493 398 is zero. There are infinitely many multiples of 400 493 398. The smallest multiples of 400 493 398 are: