It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 623 313 is not a prime number.
For example, 5 623 313 can be divided by 1 559: 5 623 313 / 1559 = 3 607.
For 5 623 313 to be a prime number, it would have been required that 5 623 313 has only two divisors, i.e., itself and 1.
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5 623 313 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 5 623 313 is about 2 371.353.
Thus, the square root of 5 623 313 is not an integer, and therefore 5 623 313 is not a square number.
The square of a number (here 5 623 313) is the result of the product of this number (5 623 313) by itself (i.e., 5 623 313 × 5 623 313); the square of 5 623 313 is sometimes called "raising 5 623 313 to the power 2", or "5 623 313 squared".
The square of 5 623 313 is 31 621 649 095 969 because 5 623 313 × 5 623 313 = 5 623 3132 = 31 621 649 095 969.
As a consequence, 5 623 313 is the square root of 31 621 649 095 969.
The multiples of 5 623 313 are all integers evenly divisible by 5 623 313, that is all numbers such that the remainder of the division by 5 623 313 is zero. There are infinitely many multiples of 5 623 313. The smallest multiples of 5 623 313 are: