It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 5 621 639 is not a prime number.
For example, 5 621 639 can be divided by 433: 5 621 639 / 433 = 12 983.
For 5 621 639 to be a prime number, it would have been required that 5 621 639 has only two divisors, i.e., itself and 1.
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5 621 639 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 5 621 639 is about 2 371.000.
Thus, the square root of 5 621 639 is not an integer, and therefore 5 621 639 is not a square number.
The square of a number (here 5 621 639) is the result of the product of this number (5 621 639) by itself (i.e., 5 621 639 × 5 621 639); the square of 5 621 639 is sometimes called "raising 5 621 639 to the power 2", or "5 621 639 squared".
The square of 5 621 639 is 31 602 825 046 321 because 5 621 639 × 5 621 639 = 5 621 6392 = 31 602 825 046 321.
As a consequence, 5 621 639 is the square root of 31 602 825 046 321.
The multiples of 5 621 639 are all integers evenly divisible by 5 621 639, that is all numbers such that the remainder of the division by 5 621 639 is zero. There are infinitely many multiples of 5 621 639. The smallest multiples of 5 621 639 are: