It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 520 138 is not a prime number.
For example, 520 138 can be divided by 2: 520 138 / 2 = 260 069.
For 520 138 to be a prime number, it would have been required that 520 138 has only two divisors, i.e., itself and 1.
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520 138 is an even number, because it is evenly divisible by 2: 520 138 / 2 = 260 069.
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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 520 138 is about 721.206.
Thus, the square root of 520 138 is not an integer, and therefore 520 138 is not a square number.
The square of a number (here 520 138) is the result of the product of this number (520 138) by itself (i.e., 520 138 × 520 138); the square of 520 138 is sometimes called "raising 520 138 to the power 2", or "520 138 squared".
The square of 520 138 is 270 543 539 044 because 520 138 × 520 138 = 520 1382 = 270 543 539 044.
As a consequence, 520 138 is the square root of 270 543 539 044.
The multiples of 520 138 are all integers evenly divisible by 520 138, that is all numbers such that the remainder of the division by 520 138 is zero. There are infinitely many multiples of 520 138. The smallest multiples of 520 138 are: