It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 623 999 is not a prime number.
For example, 5 623 999 can be divided by 29: 5 623 999 / 29 = 193 931.
For 5 623 999 to be a prime number, it would have been required that 5 623 999 has only two divisors, i.e., itself and 1.
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5 623 999 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 5 623 999 is about 2 371.497.
Thus, the square root of 5 623 999 is not an integer, and therefore 5 623 999 is not a square number.
The square of a number (here 5 623 999) is the result of the product of this number (5 623 999) by itself (i.e., 5 623 999 × 5 623 999); the square of 5 623 999 is sometimes called "raising 5 623 999 to the power 2", or "5 623 999 squared".
The square of 5 623 999 is 31 629 364 752 001 because 5 623 999 × 5 623 999 = 5 623 9992 = 31 629 364 752 001.
As a consequence, 5 623 999 is the square root of 31 629 364 752 001.
The multiples of 5 623 999 are all integers evenly divisible by 5 623 999, that is all numbers such that the remainder of the division by 5 623 999 is zero. There are infinitely many multiples of 5 623 999. The smallest multiples of 5 623 999 are: