It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 392 is not a prime number.
For example, 400 392 can be divided by 2: 400 392 / 2 = 200 196.
For 400 392 to be a prime number, it would have been required that 400 392 has only two divisors, i.e., itself and 1.
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400 392 is an even number, because it is evenly divisible by 2: 400 392 / 2 = 200 196.
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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 400 392 is about 632.765.
Thus, the square root of 400 392 is not an integer, and therefore 400 392 is not a square number.
The square of a number (here 400 392) is the result of the product of this number (400 392) by itself (i.e., 400 392 × 400 392); the square of 400 392 is sometimes called "raising 400 392 to the power 2", or "400 392 squared".
The square of 400 392 is 160 313 753 664 because 400 392 × 400 392 = 400 3922 = 160 313 753 664.
As a consequence, 400 392 is the square root of 160 313 753 664.
The multiples of 400 392 are all integers evenly divisible by 400 392, that is all numbers such that the remainder of the division by 400 392 is zero. There are infinitely many multiples of 400 392. The smallest multiples of 400 392 are: