It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 16 221 is not a prime number.
For example, 16 221 can be divided by 3: 16 221 / 3 = 5 407.
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For 16 221 to be a prime number, it would have been required that 16 221 has only two divisors, i.e., itself and 1.
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16 221 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 16 221 is about 127.362.
Thus, the square root of 16 221 is not an integer, and therefore 16 221 is not a square number.
The square of a number (here 16 221) is the result of the product of this number (16 221) by itself (i.e., 16 221 × 16 221); the square of 16 221 is sometimes called "raising 16 221 to the power 2", or "16 221 squared".
The square of 16 221 is 263 120 841 because 16 221 × 16 221 = 16 2212 = 263 120 841.
As a consequence, 16 221 is the square root of 263 120 841.
The multiples of 16 221 are all integers evenly divisible by 16 221, that is all numbers such that the remainder of the division by 16 221 is zero. There are infinitely many multiples of 16 221. The smallest multiples of 16 221 are: