It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 621 618 is not a prime number.
For example, 5 621 618 can be divided by 2: 5 621 618 / 2 = 2 810 809.
For 5 621 618 to be a prime number, it would have been required that 5 621 618 has only two divisors, i.e., itself and 1.
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5 621 618 is an even number, because it is evenly divisible by 2: 5 621 618 / 2 = 2 810 809.
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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 5 621 618 is about 2 370.995.
Thus, the square root of 5 621 618 is not an integer, and therefore 5 621 618 is not a square number.
The square of a number (here 5 621 618) is the result of the product of this number (5 621 618) by itself (i.e., 5 621 618 × 5 621 618); the square of 5 621 618 is sometimes called "raising 5 621 618 to the power 2", or "5 621 618 squared".
The square of 5 621 618 is 31 602 588 937 924 because 5 621 618 × 5 621 618 = 5 621 6182 = 31 602 588 937 924.
As a consequence, 5 621 618 is the square root of 31 602 588 937 924.
The multiples of 5 621 618 are all integers evenly divisible by 5 621 618, that is all numbers such that the remainder of the division by 5 621 618 is zero. There are infinitely many multiples of 5 621 618. The smallest multiples of 5 621 618 are: