It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 397 644 is not a prime number.
For example, 397 644 can be divided by 2: 397 644 / 2 = 198 822.
For 397 644 to be a prime number, it would have been required that 397 644 has only two divisors, i.e., itself and 1.
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397 644 is an even number, because it is evenly divisible by 2: 397 644 / 2 = 198 822.
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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 397 644 is about 630.590.
Thus, the square root of 397 644 is not an integer, and therefore 397 644 is not a square number.
The square of a number (here 397 644) is the result of the product of this number (397 644) by itself (i.e., 397 644 × 397 644); the square of 397 644 is sometimes called "raising 397 644 to the power 2", or "397 644 squared".
The square of 397 644 is 158 120 750 736 because 397 644 × 397 644 = 397 6442 = 158 120 750 736.
As a consequence, 397 644 is the square root of 158 120 750 736.
The multiples of 397 644 are all integers evenly divisible by 397 644, that is all numbers such that the remainder of the division by 397 644 is zero. There are infinitely many multiples of 397 644. The smallest multiples of 397 644 are: