It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 427 216 is not a prime number.
For example, 427 216 can be divided by 2: 427 216 / 2 = 213 608.
For 427 216 to be a prime number, it would have been required that 427 216 has only two divisors, i.e., itself and 1.
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427 216 is an even number, because it is evenly divisible by 2: 427 216 / 2 = 213 608.
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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 427 216 is about 653.618.
Thus, the square root of 427 216 is not an integer, and therefore 427 216 is not a square number.
The square of a number (here 427 216) is the result of the product of this number (427 216) by itself (i.e., 427 216 × 427 216); the square of 427 216 is sometimes called "raising 427 216 to the power 2", or "427 216 squared".
The square of 427 216 is 182 513 510 656 because 427 216 × 427 216 = 427 2162 = 182 513 510 656.
As a consequence, 427 216 is the square root of 182 513 510 656.
The multiples of 427 216 are all integers evenly divisible by 427 216, that is all numbers such that the remainder of the division by 427 216 is zero. There are infinitely many multiples of 427 216. The smallest multiples of 427 216 are: