It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 009 867 is not a prime number.
For example, 8 009 867 can be divided by 1 993: 8 009 867 / 1993 = 4 019.
For 8 009 867 to be a prime number, it would have been required that 8 009 867 has only two divisors, i.e., itself and 1.
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8 009 867 is an odd number, because it is not evenly divisible by 2.
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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 8 009 867 is about 2 830.171.
Thus, the square root of 8 009 867 is not an integer, and therefore 8 009 867 is not a square number.
The square of a number (here 8 009 867) is the result of the product of this number (8 009 867) by itself (i.e., 8 009 867 × 8 009 867); the square of 8 009 867 is sometimes called "raising 8 009 867 to the power 2", or "8 009 867 squared".
The square of 8 009 867 is 64 157 969 357 689 because 8 009 867 × 8 009 867 = 8 009 8672 = 64 157 969 357 689.
As a consequence, 8 009 867 is the square root of 64 157 969 357 689.
The multiples of 8 009 867 are all integers evenly divisible by 8 009 867, that is all numbers such that the remainder of the division by 8 009 867 is zero. There are infinitely many multiples of 8 009 867. The smallest multiples of 8 009 867 are: