It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 067 416 is not a prime number.
For example, 421 067 416 can be divided by 2: 421 067 416 / 2 = 210 533 708.
For 421 067 416 to be a prime number, it would have been required that 421 067 416 has only two divisors, i.e., itself and 1.
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421 067 416 is an even number, because it is evenly divisible by 2: 421 067 416 / 2 = 210 533 708.
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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 421 067 416 is about 20 519.927.
Thus, the square root of 421 067 416 is not an integer, and therefore 421 067 416 is not a square number.
The square of a number (here 421 067 416) is the result of the product of this number (421 067 416) by itself (i.e., 421 067 416 × 421 067 416); the square of 421 067 416 is sometimes called "raising 421 067 416 to the power 2", or "421 067 416 squared".
The square of 421 067 416 is 177 297 768 816 917 056 because 421 067 416 × 421 067 416 = 421 067 4162 = 177 297 768 816 917 056.
As a consequence, 421 067 416 is the square root of 177 297 768 816 917 056.
421 067 416 is a number with 9 digits.
The multiples of 421 067 416 are all integers evenly divisible by 421 067 416, that is all numbers such that the remainder of the division by 421 067 416 is zero. There are infinitely many multiples of 421 067 416. The smallest multiples of 421 067 416 are: