It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 7 518 507 is not a prime number.
For example, 7 518 507 can be divided by 3: 7 518 507 / 3 = 2 506 169.
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For 7 518 507 to be a prime number, it would have been required that 7 518 507 has only two divisors, i.e., itself and 1.
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7 518 507 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 7 518 507 is about 2 741.990.
Thus, the square root of 7 518 507 is not an integer, and therefore 7 518 507 is not a square number.
The square of a number (here 7 518 507) is the result of the product of this number (7 518 507) by itself (i.e., 7 518 507 × 7 518 507); the square of 7 518 507 is sometimes called "raising 7 518 507 to the power 2", or "7 518 507 squared".
The square of 7 518 507 is 56 527 947 509 049 because 7 518 507 × 7 518 507 = 7 518 5072 = 56 527 947 509 049.
As a consequence, 7 518 507 is the square root of 56 527 947 509 049.
The multiples of 7 518 507 are all integers evenly divisible by 7 518 507, that is all numbers such that the remainder of the division by 7 518 507 is zero. There are infinitely many multiples of 7 518 507. The smallest multiples of 7 518 507 are: