It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 4 518 013 is not a prime number.
For example, 4 518 013 can be divided by 1 613: 4 518 013 / 1613 = 2 801.
For 4 518 013 to be a prime number, it would have been required that 4 518 013 has only two divisors, i.e., itself and 1.
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4 518 013 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 4 518 013 is about 2 125.562.
Thus, the square root of 4 518 013 is not an integer, and therefore 4 518 013 is not a square number.
The square of a number (here 4 518 013) is the result of the product of this number (4 518 013) by itself (i.e., 4 518 013 × 4 518 013); the square of 4 518 013 is sometimes called "raising 4 518 013 to the power 2", or "4 518 013 squared".
The square of 4 518 013 is 20 412 441 468 169 because 4 518 013 × 4 518 013 = 4 518 0132 = 20 412 441 468 169.
As a consequence, 4 518 013 is the square root of 20 412 441 468 169.
The multiples of 4 518 013 are all integers evenly divisible by 4 518 013, that is all numbers such that the remainder of the division by 4 518 013 is zero. There are infinitely many multiples of 4 518 013. The smallest multiples of 4 518 013 are: