It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 8 000 013 is not a prime number.
For example, 8 000 013 can be divided by 3: 8 000 013 / 3 = 2 666 671.
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For 8 000 013 to be a prime number, it would have been required that 8 000 013 has only two divisors, i.e., itself and 1.
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8 000 013 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 8 000 013 is about 2 828.429.
Thus, the square root of 8 000 013 is not an integer, and therefore 8 000 013 is not a square number.
The square of a number (here 8 000 013) is the result of the product of this number (8 000 013) by itself (i.e., 8 000 013 × 8 000 013); the square of 8 000 013 is sometimes called "raising 8 000 013 to the power 2", or "8 000 013 squared".
The square of 8 000 013 is 64 000 208 000 169 because 8 000 013 × 8 000 013 = 8 000 0132 = 64 000 208 000 169.
As a consequence, 8 000 013 is the square root of 64 000 208 000 169.
The multiples of 8 000 013 are all integers evenly divisible by 8 000 013, that is all numbers such that the remainder of the division by 8 000 013 is zero. There are infinitely many multiples of 8 000 013. The smallest multiples of 8 000 013 are: