It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 6 397 123 is not a prime number.
For example, 6 397 123 can be divided by 47: 6 397 123 / 47 = 136 109.
For 6 397 123 to be a prime number, it would have been required that 6 397 123 has only two divisors, i.e., itself and 1.
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6 397 123 is an odd number, because it is not evenly divisible by 2.
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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 6 397 123 is about 2 529.253.
Thus, the square root of 6 397 123 is not an integer, and therefore 6 397 123 is not a square number.
The square of a number (here 6 397 123) is the result of the product of this number (6 397 123) by itself (i.e., 6 397 123 × 6 397 123); the square of 6 397 123 is sometimes called "raising 6 397 123 to the power 2", or "6 397 123 squared".
The square of 6 397 123 is 40 923 182 677 129 because 6 397 123 × 6 397 123 = 6 397 1232 = 40 923 182 677 129.
As a consequence, 6 397 123 is the square root of 40 923 182 677 129.
The multiples of 6 397 123 are all integers evenly divisible by 6 397 123, that is all numbers such that the remainder of the division by 6 397 123 is zero. There are infinitely many multiples of 6 397 123. The smallest multiples of 6 397 123 are: