It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 399 891 is not a prime number.
For example, 5 399 891 can be divided by 7: 5 399 891 / 7 = 771 413.
For 5 399 891 to be a prime number, it would have been required that 5 399 891 has only two divisors, i.e., itself and 1.
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5 399 891 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 5 399 891 is about 2 323.767.
Thus, the square root of 5 399 891 is not an integer, and therefore 5 399 891 is not a square number.
The square of a number (here 5 399 891) is the result of the product of this number (5 399 891) by itself (i.e., 5 399 891 × 5 399 891); the square of 5 399 891 is sometimes called "raising 5 399 891 to the power 2", or "5 399 891 squared".
The square of 5 399 891 is 29 158 822 811 881 because 5 399 891 × 5 399 891 = 5 399 8912 = 29 158 822 811 881.
As a consequence, 5 399 891 is the square root of 29 158 822 811 881.
The multiples of 5 399 891 are all integers evenly divisible by 5 399 891, that is all numbers such that the remainder of the division by 5 399 891 is zero. There are infinitely many multiples of 5 399 891. The smallest multiples of 5 399 891 are: