It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 842 518 is not a prime number.
For example, 42 842 518 can be divided by 2: 42 842 518 / 2 = 21 421 259.
For 42 842 518 to be a prime number, it would have been required that 42 842 518 has only two divisors, i.e., itself and 1.
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42 842 518 is an even number, because it is evenly divisible by 2: 42 842 518 / 2 = 21 421 259.
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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 42 842 518 is about 6 545.420.
Thus, the square root of 42 842 518 is not an integer, and therefore 42 842 518 is not a square number.
The square of a number (here 42 842 518) is the result of the product of this number (42 842 518) by itself (i.e., 42 842 518 × 42 842 518); the square of 42 842 518 is sometimes called "raising 42 842 518 to the power 2", or "42 842 518 squared".
The square of 42 842 518 is 1 835 481 348 580 324 because 42 842 518 × 42 842 518 = 42 842 5182 = 1 835 481 348 580 324.
As a consequence, 42 842 518 is the square root of 1 835 481 348 580 324.
42 842 518 is a number with 8 digits.
The multiples of 42 842 518 are all integers evenly divisible by 42 842 518, that is all numbers such that the remainder of the division by 42 842 518 is zero. There are infinitely many multiples of 42 842 518. The smallest multiples of 42 842 518 are: