It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 388 is not a prime number.
For example, 397 388 can be divided by 2: 397 388 / 2 = 198 694.
For 397 388 to be a prime number, it would have been required that 397 388 has only two divisors, i.e., itself and 1.
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397 388 is an even number, because it is evenly divisible by 2: 397 388 / 2 = 198 694.
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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 397 388 is about 630.387.
Thus, the square root of 397 388 is not an integer, and therefore 397 388 is not a square number.
The square of a number (here 397 388) is the result of the product of this number (397 388) by itself (i.e., 397 388 × 397 388); the square of 397 388 is sometimes called "raising 397 388 to the power 2", or "397 388 squared".
The square of 397 388 is 157 917 222 544 because 397 388 × 397 388 = 397 3882 = 157 917 222 544.
As a consequence, 397 388 is the square root of 157 917 222 544.
The multiples of 397 388 are all integers evenly divisible by 397 388, that is all numbers such that the remainder of the division by 397 388 is zero. There are infinitely many multiples of 397 388. The smallest multiples of 397 388 are: