It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 16 121 567 is not a prime number.
For example, 16 121 567 can be divided by 7: 16 121 567 / 7 = 2 303 081.
For 16 121 567 to be a prime number, it would have been required that 16 121 567 has only two divisors, i.e., itself and 1.
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16 121 567 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 16 121 567 is about 4 015.167.
Thus, the square root of 16 121 567 is not an integer, and therefore 16 121 567 is not a square number.
The square of a number (here 16 121 567) is the result of the product of this number (16 121 567) by itself (i.e., 16 121 567 × 16 121 567); the square of 16 121 567 is sometimes called "raising 16 121 567 to the power 2", or "16 121 567 squared".
The square of 16 121 567 is 259 904 922 535 489 because 16 121 567 × 16 121 567 = 16 121 5672 = 259 904 922 535 489.
As a consequence, 16 121 567 is the square root of 259 904 922 535 489.
16 121 567 is a number with 8 digits.
The multiples of 16 121 567 are all integers evenly divisible by 16 121 567, that is all numbers such that the remainder of the division by 16 121 567 is zero. There are infinitely many multiples of 16 121 567. The smallest multiples of 16 121 567 are: