It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 400 396 is not a prime number.
For example, 400 396 can be divided by 2: 400 396 / 2 = 200 198.
For 400 396 to be a prime number, it would have been required that 400 396 has only two divisors, i.e., itself and 1.
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400 396 is an even number, because it is evenly divisible by 2: 400 396 / 2 = 200 198.
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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 400 396 is about 632.769.
Thus, the square root of 400 396 is not an integer, and therefore 400 396 is not a square number.
The square of a number (here 400 396) is the result of the product of this number (400 396) by itself (i.e., 400 396 × 400 396); the square of 400 396 is sometimes called "raising 400 396 to the power 2", or "400 396 squared".
The square of 400 396 is 160 316 956 816 because 400 396 × 400 396 = 400 3962 = 160 316 956 816.
As a consequence, 400 396 is the square root of 160 316 956 816.
The multiples of 400 396 are all integers evenly divisible by 400 396, that is all numbers such that the remainder of the division by 400 396 is zero. There are infinitely many multiples of 400 396. The smallest multiples of 400 396 are: