It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 004 042 is not a prime number.
For example, 420 004 042 can be divided by 2: 420 004 042 / 2 = 210 002 021.
For 420 004 042 to be a prime number, it would have been required that 420 004 042 has only two divisors, i.e., itself and 1.
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420 004 042 is an even number, because it is evenly divisible by 2: 420 004 042 / 2 = 210 002 021.
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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 420 004 042 is about 20 494.000.
Thus, the square root of 420 004 042 is not an integer, and therefore 420 004 042 is not a square number.
The square of a number (here 420 004 042) is the result of the product of this number (420 004 042) by itself (i.e., 420 004 042 × 420 004 042); the square of 420 004 042 is sometimes called "raising 420 004 042 to the power 2", or "420 004 042 squared".
The square of 420 004 042 is 176 403 395 296 337 760 because 420 004 042 × 420 004 042 = 420 004 0422 = 176 403 395 296 337 760.
As a consequence, 420 004 042 is the square root of 176 403 395 296 337 760.
420 004 042 is a number with 9 digits.
The multiples of 420 004 042 are all integers evenly divisible by 420 004 042, that is all numbers such that the remainder of the division by 420 004 042 is zero. There are infinitely many multiples of 420 004 042. The smallest multiples of 420 004 042 are: