It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 700 518 is not a prime number.
For example, 700 518 can be divided by 2: 700 518 / 2 = 350 259.
For 700 518 to be a prime number, it would have been required that 700 518 has only two divisors, i.e., itself and 1.
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700 518 is an even number, because it is evenly divisible by 2: 700 518 / 2 = 350 259.
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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 700 518 is about 836.970.
Thus, the square root of 700 518 is not an integer, and therefore 700 518 is not a square number.
The square of a number (here 700 518) is the result of the product of this number (700 518) by itself (i.e., 700 518 × 700 518); the square of 700 518 is sometimes called "raising 700 518 to the power 2", or "700 518 squared".
The square of 700 518 is 490 725 468 324 because 700 518 × 700 518 = 700 5182 = 490 725 468 324.
As a consequence, 700 518 is the square root of 490 725 468 324.
The multiples of 700 518 are all integers evenly divisible by 700 518, that is all numbers such that the remainder of the division by 700 518 is zero. There are infinitely many multiples of 700 518. The smallest multiples of 700 518 are: