14.7 = 147/10
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It is 147.
147 is a whole number, so no rounding is needed.
No, it is not a prime. 147=3*7*7.
147 has factors other than 1 and itself, so it is not a prime number. For example, 147 is divisible by 3. (You can quickly check this by adding up the digits of 147: 1 + 4 + 7 = 12. If the sum of the digits is divisible by 3, so is the number.) Therefore, 147 is a composite number.
The smallest prime number that will divide 147 evenly is three.