It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 016 509 is not a prime number.
For example, 1 016 509 can be divided by 13: 1 016 509 / 13 = 78 193.
For 1 016 509 to be a prime number, it would have been required that 1 016 509 has only two divisors, i.e., itself and 1.
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1 016 509 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 1 016 509 is about 1 008.221.
Thus, the square root of 1 016 509 is not an integer, and therefore 1 016 509 is not a square number.
The square of a number (here 1 016 509) is the result of the product of this number (1 016 509) by itself (i.e., 1 016 509 × 1 016 509); the square of 1 016 509 is sometimes called "raising 1 016 509 to the power 2", or "1 016 509 squared".
The square of 1 016 509 is 1 033 290 547 081 because 1 016 509 × 1 016 509 = 1 016 5092 = 1 033 290 547 081.
As a consequence, 1 016 509 is the square root of 1 033 290 547 081.
The multiples of 1 016 509 are all integers evenly divisible by 1 016 509, that is all numbers such that the remainder of the division by 1 016 509 is zero. There are infinitely many multiples of 1 016 509. The smallest multiples of 1 016 509 are: