It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 667 518 is not a prime number.
For example, 667 518 can be divided by 2: 667 518 / 2 = 333 759.
For 667 518 to be a prime number, it would have been required that 667 518 has only two divisors, i.e., itself and 1.
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667 518 is an even number, because it is evenly divisible by 2: 667 518 / 2 = 333 759.
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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 667 518 is about 817.018.
Thus, the square root of 667 518 is not an integer, and therefore 667 518 is not a square number.
The square of a number (here 667 518) is the result of the product of this number (667 518) by itself (i.e., 667 518 × 667 518); the square of 667 518 is sometimes called "raising 667 518 to the power 2", or "667 518 squared".
The square of 667 518 is 445 580 280 324 because 667 518 × 667 518 = 667 5182 = 445 580 280 324.
As a consequence, 667 518 is the square root of 445 580 280 324.
The multiples of 667 518 are all integers evenly divisible by 667 518, that is all numbers such that the remainder of the division by 667 518 is zero. There are infinitely many multiples of 667 518. The smallest multiples of 667 518 are: