It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 405 623 is not a prime number.
For example, 5 405 623 can be divided by 167: 5 405 623 / 167 = 32 369.
For 5 405 623 to be a prime number, it would have been required that 5 405 623 has only two divisors, i.e., itself and 1.
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5 405 623 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 5 405 623 is about 2 325.000.
Thus, the square root of 5 405 623 is not an integer, and therefore 5 405 623 is not a square number.
The square of a number (here 5 405 623) is the result of the product of this number (5 405 623) by itself (i.e., 5 405 623 × 5 405 623); the square of 5 405 623 is sometimes called "raising 5 405 623 to the power 2", or "5 405 623 squared".
The square of 5 405 623 is 29 220 760 018 129 because 5 405 623 × 5 405 623 = 5 405 6232 = 29 220 760 018 129.
As a consequence, 5 405 623 is the square root of 29 220 760 018 129.
The multiples of 5 405 623 are all integers evenly divisible by 5 405 623, that is all numbers such that the remainder of the division by 5 405 623 is zero. There are infinitely many multiples of 5 405 623. The smallest multiples of 5 405 623 are: