It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 423 644 674 is not a prime number.
For example, 423 644 674 can be divided by 2: 423 644 674 / 2 = 211 822 337.
For 423 644 674 to be a prime number, it would have been required that 423 644 674 has only two divisors, i.e., itself and 1.
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423 644 674 is an even number, because it is evenly divisible by 2: 423 644 674 / 2 = 211 822 337.
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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 423 644 674 is about 20 582.630.
Thus, the square root of 423 644 674 is not an integer, and therefore 423 644 674 is not a square number.
The square of a number (here 423 644 674) is the result of the product of this number (423 644 674) by itself (i.e., 423 644 674 × 423 644 674); the square of 423 644 674 is sometimes called "raising 423 644 674 to the power 2", or "423 644 674 squared".
The square of 423 644 674 is 179 474 809 808 566 272 because 423 644 674 × 423 644 674 = 423 644 6742 = 179 474 809 808 566 272.
As a consequence, 423 644 674 is the square root of 179 474 809 808 566 272.
423 644 674 is a number with 9 digits.
The multiples of 423 644 674 are all integers evenly divisible by 423 644 674, that is all numbers such that the remainder of the division by 423 644 674 is zero. There are infinitely many multiples of 423 644 674. The smallest multiples of 423 644 674 are: