It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 644 988 is not a prime number.
For example, 421 644 988 can be divided by 2: 421 644 988 / 2 = 210 822 494.
For 421 644 988 to be a prime number, it would have been required that 421 644 988 has only two divisors, i.e., itself and 1.
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421 644 988 is an even number, because it is evenly divisible by 2: 421 644 988 / 2 = 210 822 494.
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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 421 644 988 is about 20 533.996.
Thus, the square root of 421 644 988 is not an integer, and therefore 421 644 988 is not a square number.
The square of a number (here 421 644 988) is the result of the product of this number (421 644 988) by itself (i.e., 421 644 988 × 421 644 988); the square of 421 644 988 is sometimes called "raising 421 644 988 to the power 2", or "421 644 988 squared".
The square of 421 644 988 is 177 784 495 905 520 128 because 421 644 988 × 421 644 988 = 421 644 9882 = 177 784 495 905 520 128.
As a consequence, 421 644 988 is the square root of 177 784 495 905 520 128.
421 644 988 is a number with 9 digits.
The multiples of 421 644 988 are all integers evenly divisible by 421 644 988, that is all numbers such that the remainder of the division by 421 644 988 is zero. There are infinitely many multiples of 421 644 988. The smallest multiples of 421 644 988 are: