It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 490 402 is not a prime number.
For example, 8 490 402 can be divided by 2: 8 490 402 / 2 = 4 245 201.
For 8 490 402 to be a prime number, it would have been required that 8 490 402 has only two divisors, i.e., itself and 1.
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8 490 402 is an even number, because it is evenly divisible by 2: 8 490 402 / 2 = 4 245 201.
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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 8 490 402 is about 2 913.829.
Thus, the square root of 8 490 402 is not an integer, and therefore 8 490 402 is not a square number.
The square of a number (here 8 490 402) is the result of the product of this number (8 490 402) by itself (i.e., 8 490 402 × 8 490 402); the square of 8 490 402 is sometimes called "raising 8 490 402 to the power 2", or "8 490 402 squared".
The square of 8 490 402 is 72 086 926 121 604 because 8 490 402 × 8 490 402 = 8 490 4022 = 72 086 926 121 604.
As a consequence, 8 490 402 is the square root of 72 086 926 121 604.
The multiples of 8 490 402 are all integers evenly divisible by 8 490 402, that is all numbers such that the remainder of the division by 8 490 402 is zero. There are infinitely many multiples of 8 490 402. The smallest multiples of 8 490 402 are: