It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 397 407 is not a prime number.
For example, 8 397 407 can be divided by 139: 8 397 407 / 139 = 60 413.
For 8 397 407 to be a prime number, it would have been required that 8 397 407 has only two divisors, i.e., itself and 1.
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8 397 407 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 8 397 407 is about 2 897.828.
Thus, the square root of 8 397 407 is not an integer, and therefore 8 397 407 is not a square number.
The square of a number (here 8 397 407) is the result of the product of this number (8 397 407) by itself (i.e., 8 397 407 × 8 397 407); the square of 8 397 407 is sometimes called "raising 8 397 407 to the power 2", or "8 397 407 squared".
The square of 8 397 407 is 70 516 444 323 649 because 8 397 407 × 8 397 407 = 8 397 4072 = 70 516 444 323 649.
As a consequence, 8 397 407 is the square root of 70 516 444 323 649.
The multiples of 8 397 407 are all integers evenly divisible by 8 397 407, that is all numbers such that the remainder of the division by 8 397 407 is zero. There are infinitely many multiples of 8 397 407. The smallest multiples of 8 397 407 are: