It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 397 787 is not a prime number.
For example, 5 397 787 can be divided by 139: 5 397 787 / 139 = 38 833.
For 5 397 787 to be a prime number, it would have been required that 5 397 787 has only two divisors, i.e., itself and 1.
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5 397 787 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 5 397 787 is about 2 323.314.
Thus, the square root of 5 397 787 is not an integer, and therefore 5 397 787 is not a square number.
The square of a number (here 5 397 787) is the result of the product of this number (5 397 787) by itself (i.e., 5 397 787 × 5 397 787); the square of 5 397 787 is sometimes called "raising 5 397 787 to the power 2", or "5 397 787 squared".
The square of 5 397 787 is 29 136 104 497 369 because 5 397 787 × 5 397 787 = 5 397 7872 = 29 136 104 497 369.
As a consequence, 5 397 787 is the square root of 29 136 104 497 369.
The multiples of 5 397 787 are all integers evenly divisible by 5 397 787, that is all numbers such that the remainder of the division by 5 397 787 is zero. There are infinitely many multiples of 5 397 787. The smallest multiples of 5 397 787 are: