It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 515 018 is not a prime number.
For example, 515 018 can be divided by 2: 515 018 / 2 = 257 509.
For 515 018 to be a prime number, it would have been required that 515 018 has only two divisors, i.e., itself and 1.
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515 018 is an even number, because it is evenly divisible by 2: 515 018 / 2 = 257 509.
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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 515 018 is about 717.648.
Thus, the square root of 515 018 is not an integer, and therefore 515 018 is not a square number.
The square of a number (here 515 018) is the result of the product of this number (515 018) by itself (i.e., 515 018 × 515 018); the square of 515 018 is sometimes called "raising 515 018 to the power 2", or "515 018 squared".
The square of 515 018 is 265 243 540 324 because 515 018 × 515 018 = 515 0182 = 265 243 540 324.
As a consequence, 515 018 is the square root of 265 243 540 324.
The multiples of 515 018 are all integers evenly divisible by 515 018, that is all numbers such that the remainder of the division by 515 018 is zero. There are infinitely many multiples of 515 018. The smallest multiples of 515 018 are: