It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 420 908 is not a prime number.
For example, 8 420 908 can be divided by 2: 8 420 908 / 2 = 4 210 454.
For 8 420 908 to be a prime number, it would have been required that 8 420 908 has only two divisors, i.e., itself and 1.
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8 420 908 is an even number, because it is evenly divisible by 2: 8 420 908 / 2 = 4 210 454.
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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 8 420 908 is about 2 901.880.
Thus, the square root of 8 420 908 is not an integer, and therefore 8 420 908 is not a square number.
The square of a number (here 8 420 908) is the result of the product of this number (8 420 908) by itself (i.e., 8 420 908 × 8 420 908); the square of 8 420 908 is sometimes called "raising 8 420 908 to the power 2", or "8 420 908 squared".
The square of 8 420 908 is 70 911 691 544 464 because 8 420 908 × 8 420 908 = 8 420 9082 = 70 911 691 544 464.
As a consequence, 8 420 908 is the square root of 70 911 691 544 464.
The multiples of 8 420 908 are all integers evenly divisible by 8 420 908, that is all numbers such that the remainder of the division by 8 420 908 is zero. There are infinitely many multiples of 8 420 908. The smallest multiples of 8 420 908 are: