It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 818 421 is not a prime number.
For example, 5 818 421 can be divided by 7: 5 818 421 / 7 = 831 203.
For 5 818 421 to be a prime number, it would have been required that 5 818 421 has only two divisors, i.e., itself and 1.
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5 818 421 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 5 818 421 is about 2 412.140.
Thus, the square root of 5 818 421 is not an integer, and therefore 5 818 421 is not a square number.
The square of a number (here 5 818 421) is the result of the product of this number (5 818 421) by itself (i.e., 5 818 421 × 5 818 421); the square of 5 818 421 is sometimes called "raising 5 818 421 to the power 2", or "5 818 421 squared".
The square of 5 818 421 is 33 854 022 933 241 because 5 818 421 × 5 818 421 = 5 818 4212 = 33 854 022 933 241.
As a consequence, 5 818 421 is the square root of 33 854 022 933 241.
The multiples of 5 818 421 are all integers evenly divisible by 5 818 421, that is all numbers such that the remainder of the division by 5 818 421 is zero. There are infinitely many multiples of 5 818 421. The smallest multiples of 5 818 421 are: