It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 207 is not a prime number.
For example, 520 207 can be divided by 661: 520 207 / 661 = 787.
For 520 207 to be a prime number, it would have been required that 520 207 has only two divisors, i.e., itself and 1.
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520 207 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 520 207 is about 721.254.
Thus, the square root of 520 207 is not an integer, and therefore 520 207 is not a square number.
The square of a number (here 520 207) is the result of the product of this number (520 207) by itself (i.e., 520 207 × 520 207); the square of 520 207 is sometimes called "raising 520 207 to the power 2", or "520 207 squared".
The square of 520 207 is 270 615 322 849 because 520 207 × 520 207 = 520 2072 = 270 615 322 849.
As a consequence, 520 207 is the square root of 270 615 322 849.
The multiples of 520 207 are all integers evenly divisible by 520 207, that is all numbers such that the remainder of the division by 520 207 is zero. There are infinitely many multiples of 520 207. The smallest multiples of 520 207 are: