It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 526 009 is not a prime number.
For example, 1 526 009 can be divided by 29: 1 526 009 / 29 = 52 621.
For 1 526 009 to be a prime number, it would have been required that 1 526 009 has only two divisors, i.e., itself and 1.
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1 526 009 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 1 526 009 is about 1 235.317.
Thus, the square root of 1 526 009 is not an integer, and therefore 1 526 009 is not a square number.
The square of a number (here 1 526 009) is the result of the product of this number (1 526 009) by itself (i.e., 1 526 009 × 1 526 009); the square of 1 526 009 is sometimes called "raising 1 526 009 to the power 2", or "1 526 009 squared".
The square of 1 526 009 is 2 328 703 468 081 because 1 526 009 × 1 526 009 = 1 526 0092 = 2 328 703 468 081.
As a consequence, 1 526 009 is the square root of 2 328 703 468 081.
The multiples of 1 526 009 are all integers evenly divisible by 1 526 009, that is all numbers such that the remainder of the division by 1 526 009 is zero. There are infinitely many multiples of 1 526 009. The smallest multiples of 1 526 009 are: