It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 42 499 728 is not a prime number.
For example, 42 499 728 can be divided by 2: 42 499 728 / 2 = 21 249 864.
For 42 499 728 to be a prime number, it would have been required that 42 499 728 has only two divisors, i.e., itself and 1.
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42 499 728 is an even number, because it is evenly divisible by 2: 42 499 728 / 2 = 21 249 864.
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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 42 499 728 is about 6 519.182.
Thus, the square root of 42 499 728 is not an integer, and therefore 42 499 728 is not a square number.
The square of a number (here 42 499 728) is the result of the product of this number (42 499 728) by itself (i.e., 42 499 728 × 42 499 728); the square of 42 499 728 is sometimes called "raising 42 499 728 to the power 2", or "42 499 728 squared".
The square of 42 499 728 is 1 806 226 880 073 984 because 42 499 728 × 42 499 728 = 42 499 7282 = 1 806 226 880 073 984.
As a consequence, 42 499 728 is the square root of 1 806 226 880 073 984.
42 499 728 is a number with 8 digits.
The multiples of 42 499 728 are all integers evenly divisible by 42 499 728, that is all numbers such that the remainder of the division by 42 499 728 is zero. There are infinitely many multiples of 42 499 728. The smallest multiples of 42 499 728 are: