It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 338 798 is not a prime number.
For example, 400 338 798 can be divided by 2: 400 338 798 / 2 = 200 169 399.
For 400 338 798 to be a prime number, it would have been required that 400 338 798 has only two divisors, i.e., itself and 1.
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400 338 798 is an even number, because it is evenly divisible by 2: 400 338 798 / 2 = 200 169 399.
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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 400 338 798 is about 20 008.468.
Thus, the square root of 400 338 798 is not an integer, and therefore 400 338 798 is not a square number.
The square of a number (here 400 338 798) is the result of the product of this number (400 338 798) by itself (i.e., 400 338 798 × 400 338 798); the square of 400 338 798 is sometimes called "raising 400 338 798 to the power 2", or "400 338 798 squared".
The square of 400 338 798 is 160 271 153 184 084 800 because 400 338 798 × 400 338 798 = 400 338 7982 = 160 271 153 184 084 800.
As a consequence, 400 338 798 is the square root of 160 271 153 184 084 800.
400 338 798 is a number with 9 digits.
The multiples of 400 338 798 are all integers evenly divisible by 400 338 798, that is all numbers such that the remainder of the division by 400 338 798 is zero. There are infinitely many multiples of 400 338 798. The smallest multiples of 400 338 798 are: