It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 518 421 is not a prime number.
For example, 1 518 421 can be divided by 67: 1 518 421 / 67 = 22 663.
For 1 518 421 to be a prime number, it would have been required that 1 518 421 has only two divisors, i.e., itself and 1.
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1 518 421 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 1 518 421 is about 1 232.242.
Thus, the square root of 1 518 421 is not an integer, and therefore 1 518 421 is not a square number.
The square of a number (here 1 518 421) is the result of the product of this number (1 518 421) by itself (i.e., 1 518 421 × 1 518 421); the square of 1 518 421 is sometimes called "raising 1 518 421 to the power 2", or "1 518 421 squared".
The square of 1 518 421 is 2 305 602 333 241 because 1 518 421 × 1 518 421 = 1 518 4212 = 2 305 602 333 241.
As a consequence, 1 518 421 is the square root of 2 305 602 333 241.
The multiples of 1 518 421 are all integers evenly divisible by 1 518 421, that is all numbers such that the remainder of the division by 1 518 421 is zero. There are infinitely many multiples of 1 518 421. The smallest multiples of 1 518 421 are: