It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 421 408 is not a prime number.
For example, 8 421 408 can be divided by 2: 8 421 408 / 2 = 4 210 704.
For 8 421 408 to be a prime number, it would have been required that 8 421 408 has only two divisors, i.e., itself and 1.
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8 421 408 is an even number, because it is evenly divisible by 2: 8 421 408 / 2 = 4 210 704.
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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 8 421 408 is about 2 901.966.
Thus, the square root of 8 421 408 is not an integer, and therefore 8 421 408 is not a square number.
The square of a number (here 8 421 408) is the result of the product of this number (8 421 408) by itself (i.e., 8 421 408 × 8 421 408); the square of 8 421 408 is sometimes called "raising 8 421 408 to the power 2", or "8 421 408 squared".
The square of 8 421 408 is 70 920 112 702 464 because 8 421 408 × 8 421 408 = 8 421 4082 = 70 920 112 702 464.
As a consequence, 8 421 408 is the square root of 70 920 112 702 464.
The multiples of 8 421 408 are all integers evenly divisible by 8 421 408, that is all numbers such that the remainder of the division by 8 421 408 is zero. There are infinitely many multiples of 8 421 408. The smallest multiples of 8 421 408 are: