It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 620 518 is not a prime number.
For example, 620 518 can be divided by 2: 620 518 / 2 = 310 259.
For 620 518 to be a prime number, it would have been required that 620 518 has only two divisors, i.e., itself and 1.
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620 518 is an even number, because it is evenly divisible by 2: 620 518 / 2 = 310 259.
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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 620 518 is about 787.730.
Thus, the square root of 620 518 is not an integer, and therefore 620 518 is not a square number.
The square of a number (here 620 518) is the result of the product of this number (620 518) by itself (i.e., 620 518 × 620 518); the square of 620 518 is sometimes called "raising 620 518 to the power 2", or "620 518 squared".
The square of 620 518 is 385 042 588 324 because 620 518 × 620 518 = 620 5182 = 385 042 588 324.
As a consequence, 620 518 is the square root of 385 042 588 324.
The multiples of 620 518 are all integers evenly divisible by 620 518, that is all numbers such that the remainder of the division by 620 518 is zero. There are infinitely many multiples of 620 518. The smallest multiples of 620 518 are: