It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 704 is not a prime number.
For example, 397 704 can be divided by 2: 397 704 / 2 = 198 852.
For 397 704 to be a prime number, it would have been required that 397 704 has only two divisors, i.e., itself and 1.
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397 704 is an even number, because it is evenly divisible by 2: 397 704 / 2 = 198 852.
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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 397 704 is about 630.638.
Thus, the square root of 397 704 is not an integer, and therefore 397 704 is not a square number.
The square of a number (here 397 704) is the result of the product of this number (397 704) by itself (i.e., 397 704 × 397 704); the square of 397 704 is sometimes called "raising 397 704 to the power 2", or "397 704 squared".
The square of 397 704 is 158 168 471 616 because 397 704 × 397 704 = 397 7042 = 158 168 471 616.
As a consequence, 397 704 is the square root of 158 168 471 616.
The multiples of 397 704 are all integers evenly divisible by 397 704, that is all numbers such that the remainder of the division by 397 704 is zero. There are infinitely many multiples of 397 704. The smallest multiples of 397 704 are: