It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 518 574 is not a prime number.
For example, 7 518 574 can be divided by 2: 7 518 574 / 2 = 3 759 287.
For 7 518 574 to be a prime number, it would have been required that 7 518 574 has only two divisors, i.e., itself and 1.
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7 518 574 is an even number, because it is evenly divisible by 2: 7 518 574 / 2 = 3 759 287.
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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 7 518 574 is about 2 742.002.
Thus, the square root of 7 518 574 is not an integer, and therefore 7 518 574 is not a square number.
The square of a number (here 7 518 574) is the result of the product of this number (7 518 574) by itself (i.e., 7 518 574 × 7 518 574); the square of 7 518 574 is sometimes called "raising 7 518 574 to the power 2", or "7 518 574 squared".
The square of 7 518 574 is 56 528 954 993 476 because 7 518 574 × 7 518 574 = 7 518 5742 = 56 528 954 993 476.
As a consequence, 7 518 574 is the square root of 56 528 954 993 476.
The multiples of 7 518 574 are all integers evenly divisible by 7 518 574, that is all numbers such that the remainder of the division by 7 518 574 is zero. There are infinitely many multiples of 7 518 574. The smallest multiples of 7 518 574 are: