It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 616 is not a prime number.
For example, 397 616 can be divided by 2: 397 616 / 2 = 198 808.
For 397 616 to be a prime number, it would have been required that 397 616 has only two divisors, i.e., itself and 1.
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397 616 is an even number, because it is evenly divisible by 2: 397 616 / 2 = 198 808.
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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 397 616 is about 630.568.
Thus, the square root of 397 616 is not an integer, and therefore 397 616 is not a square number.
The square of a number (here 397 616) is the result of the product of this number (397 616) by itself (i.e., 397 616 × 397 616); the square of 397 616 is sometimes called "raising 397 616 to the power 2", or "397 616 squared".
The square of 397 616 is 158 098 483 456 because 397 616 × 397 616 = 397 6162 = 158 098 483 456.
As a consequence, 397 616 is the square root of 158 098 483 456.
The multiples of 397 616 are all integers evenly divisible by 397 616, that is all numbers such that the remainder of the division by 397 616 is zero. There are infinitely many multiples of 397 616. The smallest multiples of 397 616 are: