It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 804 is not a prime number.
For example, 397 804 can be divided by 2: 397 804 / 2 = 198 902.
For 397 804 to be a prime number, it would have been required that 397 804 has only two divisors, i.e., itself and 1.
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397 804 is an even number, because it is evenly divisible by 2: 397 804 / 2 = 198 902.
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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 397 804 is about 630.717.
Thus, the square root of 397 804 is not an integer, and therefore 397 804 is not a square number.
The square of a number (here 397 804) is the result of the product of this number (397 804) by itself (i.e., 397 804 × 397 804); the square of 397 804 is sometimes called "raising 397 804 to the power 2", or "397 804 squared".
The square of 397 804 is 158 248 022 416 because 397 804 × 397 804 = 397 8042 = 158 248 022 416.
As a consequence, 397 804 is the square root of 158 248 022 416.
The multiples of 397 804 are all integers evenly divisible by 397 804, that is all numbers such that the remainder of the division by 397 804 is zero. There are infinitely many multiples of 397 804. The smallest multiples of 397 804 are: