It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 642 624 is not a prime number.
For example, 420 642 624 can be divided by 2: 420 642 624 / 2 = 210 321 312.
For 420 642 624 to be a prime number, it would have been required that 420 642 624 has only two divisors, i.e., itself and 1.
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420 642 624 is an even number, because it is evenly divisible by 2: 420 642 624 / 2 = 210 321 312.
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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 420 642 624 is about 20 509.574.
Thus, the square root of 420 642 624 is not an integer, and therefore 420 642 624 is not a square number.
The square of a number (here 420 642 624) is the result of the product of this number (420 642 624) by itself (i.e., 420 642 624 × 420 642 624); the square of 420 642 624 is sometimes called "raising 420 642 624 to the power 2", or "420 642 624 squared".
The square of 420 642 624 is 176 940 217 125 605 376 because 420 642 624 × 420 642 624 = 420 642 6242 = 176 940 217 125 605 376.
As a consequence, 420 642 624 is the square root of 176 940 217 125 605 376.
420 642 624 is a number with 9 digits.
The multiples of 420 642 624 are all integers evenly divisible by 420 642 624, that is all numbers such that the remainder of the division by 420 642 624 is zero. There are infinitely many multiples of 420 642 624. The smallest multiples of 420 642 624 are: