It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 13 664 009 is not a prime number.
For example, 13 664 009 can be divided by 419: 13 664 009 / 419 = 32 611.
For 13 664 009 to be a prime number, it would have been required that 13 664 009 has only two divisors, i.e., itself and 1.
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13 664 009 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 13 664 009 is about 3 696.486.
Thus, the square root of 13 664 009 is not an integer, and therefore 13 664 009 is not a square number.
The square of a number (here 13 664 009) is the result of the product of this number (13 664 009) by itself (i.e., 13 664 009 × 13 664 009); the square of 13 664 009 is sometimes called "raising 13 664 009 to the power 2", or "13 664 009 squared".
The square of 13 664 009 is 186 705 141 952 081 because 13 664 009 × 13 664 009 = 13 664 0092 = 186 705 141 952 081.
As a consequence, 13 664 009 is the square root of 186 705 141 952 081.
13 664 009 is a number with 8 digits.
The multiples of 13 664 009 are all integers evenly divisible by 13 664 009, that is all numbers such that the remainder of the division by 13 664 009 is zero. There are infinitely many multiples of 13 664 009. The smallest multiples of 13 664 009 are: