It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 270 518 is not a prime number.
For example, 270 518 can be divided by 2: 270 518 / 2 = 135 259.
For 270 518 to be a prime number, it would have been required that 270 518 has only two divisors, i.e., itself and 1.
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270 518 is an even number, because it is evenly divisible by 2: 270 518 / 2 = 135 259.
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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 270 518 is about 520.113.
Thus, the square root of 270 518 is not an integer, and therefore 270 518 is not a square number.
The square of a number (here 270 518) is the result of the product of this number (270 518) by itself (i.e., 270 518 × 270 518); the square of 270 518 is sometimes called "raising 270 518 to the power 2", or "270 518 squared".
The square of 270 518 is 73 179 988 324 because 270 518 × 270 518 = 270 5182 = 73 179 988 324.
As a consequence, 270 518 is the square root of 73 179 988 324.
The multiples of 270 518 are all integers evenly divisible by 270 518, that is all numbers such that the remainder of the division by 270 518 is zero. There are infinitely many multiples of 270 518. The smallest multiples of 270 518 are: