It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 518 231 is not a prime number.
For example, 1 518 231 can be divided by 3: 1 518 231 / 3 = 506 077.
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For 1 518 231 to be a prime number, it would have been required that 1 518 231 has only two divisors, i.e., itself and 1.
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1 518 231 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 1 518 231 is about 1 232.165.
Thus, the square root of 1 518 231 is not an integer, and therefore 1 518 231 is not a square number.
The square of a number (here 1 518 231) is the result of the product of this number (1 518 231) by itself (i.e., 1 518 231 × 1 518 231); the square of 1 518 231 is sometimes called "raising 1 518 231 to the power 2", or "1 518 231 squared".
The square of 1 518 231 is 2 305 025 369 361 because 1 518 231 × 1 518 231 = 1 518 2312 = 2 305 025 369 361.
As a consequence, 1 518 231 is the square root of 2 305 025 369 361.
The multiples of 1 518 231 are all integers evenly divisible by 1 518 231, that is all numbers such that the remainder of the division by 1 518 231 is zero. There are infinitely many multiples of 1 518 231. The smallest multiples of 1 518 231 are: